feat: Add dynamic October 10th holiday naming for Kenya

- Introduced logic to dynamically calculate the name of the October 10th holiday based on the year:
  - Mazingira Day for 2024 and beyond
  - Utamaduni Day from 2022-2023
  - Huduma Day from 2019-2021
  - Moi Day for 2018 and earlier

- Updated test cases to validate holiday names across different years.

src/Countries/Kenya.php

@@ -17,7 +17,7 @@ protected function allHolidays(int $year): array
             "New Year's Day" => '01-01',
             'Labour day' => '05-01',
             'Madaraka Day' => '06-01',
-            'Mazingira Day' => '10-10',
+            $this->getOctober10HolidayName($year) => '10-10',
             'Mashujaa Day' => '10-20',
             'Jamhuri Day' => '12-01',
             'Christmas' => '12-25',
@@ -35,4 +35,15 @@ protected function variableHolidays(int $year): array
             'Easter Monday' => $easter->addDay(),
         ];
     }
+
+    /** @return string */
+    protected function getOctober10HolidayName(int $year): string
+    {
+        return match (true) {
+            $year >= 2024 => 'Mazingira Day',
+            $year >= 2022 => 'Utamaduni Day',
+            $year >= 2019 => 'Huduma Day',
+            default => 'Moi Day'
+        };
+    }
 }

tests/.pest/snapshots/Countries/KenyaTest/it_calculates_October_10th_holiday_as_Huduma_Day_in_2021.snap

@@ -0,0 +1,42 @@
+[
+    {
+        "name": "New Year's Day",
+        "date": "2021-01-01"
+    },
+    {
+        "name": "Good Friday",
+        "date": "2021-04-02"
+    },
+    {
+        "name": "Easter Monday",
+        "date": "2021-04-05"
+    },
+    {
+        "name": "Labour day",
+        "date": "2021-05-01"
+    },
+    {
+        "name": "Madaraka Day",
+        "date": "2021-06-01"
+    },
+    {
+        "name": "Huduma Day",
+        "date": "2021-10-10"
+    },
+    {
+        "name": "Mashujaa Day",
+        "date": "2021-10-20"
+    },
+    {
+        "name": "Jamhuri Day",
+        "date": "2021-12-01"
+    },
+    {
+        "name": "Christmas",
+        "date": "2021-12-25"
+    },
+    {
+        "name": "Boxing Day",
+        "date": "2021-12-26"
+    }
+]

tests/.pest/snapshots/Countries/KenyaTest/it_calculates_October_10th_holiday_as_Mazingira_Day_in_2024.snap

@@ -0,0 +1,42 @@
+[
+    {
+        "name": "New Year's Day",
+        "date": "2024-01-01"
+    },
+    {
+        "name": "Good Friday",
+        "date": "2024-03-29"
+    },
+    {
+        "name": "Easter Monday",
+        "date": "2024-04-01"
+    },
+    {
+        "name": "Labour day",
+        "date": "2024-05-01"
+    },
+    {
+        "name": "Madaraka Day",
+        "date": "2024-06-01"
+    },
+    {
+        "name": "Mazingira Day",
+        "date": "2024-10-10"
+    },
+    {
+        "name": "Mashujaa Day",
+        "date": "2024-10-20"
+    },
+    {
+        "name": "Jamhuri Day",
+        "date": "2024-12-01"
+    },
+    {
+        "name": "Christmas",
+        "date": "2024-12-25"
+    },
+    {
+        "name": "Boxing Day",
+        "date": "2024-12-26"
+    }
+]

tests/.pest/snapshots/Countries/KenyaTest/it_calculates_October_10th_holiday_as_Moi_Day_before_2019.snap

@@ -0,0 +1,42 @@
+[
+    {
+        "name": "New Year's Day",
+        "date": "2018-01-01"
+    },
+    {
+        "name": "Good Friday",
+        "date": "2018-03-30"
+    },
+    {
+        "name": "Easter Monday",
+        "date": "2018-04-02"
+    },
+    {
+        "name": "Labour day",
+        "date": "2018-05-01"
+    },
+    {
+        "name": "Madaraka Day",
+        "date": "2018-06-01"
+    },
+    {
+        "name": "Moi Day",
+        "date": "2018-10-10"
+    },
+    {
+        "name": "Mashujaa Day",
+        "date": "2018-10-20"
+    },
+    {
+        "name": "Jamhuri Day",
+        "date": "2018-12-01"
+    },
+    {
+        "name": "Christmas",
+        "date": "2018-12-25"
+    },
+    {
+        "name": "Boxing Day",
+        "date": "2018-12-26"
+    }
+]

tests/.pest/snapshots/Countries/KenyaTest/it_calculates_October_10th_holiday_as_Utamaduni_Day_in_2023.snap

@@ -0,0 +1,42 @@
+[
+    {
+        "name": "New Year's Day",
+        "date": "2023-01-01"
+    },
+    {
+        "name": "Good Friday",
+        "date": "2023-04-07"
+    },
+    {
+        "name": "Easter Monday",
+        "date": "2023-04-10"
+    },
+    {
+        "name": "Labour day",
+        "date": "2023-05-01"
+    },
+    {
+        "name": "Madaraka Day",
+        "date": "2023-06-01"
+    },
+    {
+        "name": "Utamaduni Day",
+        "date": "2023-10-10"
+    },
+    {
+        "name": "Mashujaa Day",
+        "date": "2023-10-20"
+    },
+    {
+        "name": "Jamhuri Day",
+        "date": "2023-12-01"
+    },
+    {
+        "name": "Christmas",
+        "date": "2023-12-25"
+    },
+    {
+        "name": "Boxing Day",
+        "date": "2023-12-26"
+    }
+]

tests/Countries/KenyaTest.php

@@ -16,3 +16,63 @@
 
     expect(formatDates($holidays))->toMatchSnapshot();
 });
+
+it('calculates October 10th holiday as Mazingira Day in 2024', function () {
+    CarbonImmutable::setTestNow('2024-10-10');
+
+    $holidays = Holidays::for(country: 'ke')->get();
+
+    expect($holidays)
+        ->toBeArray()
+        ->not()->toBeEmpty();
+
+    expect(findDate($holidays, 'Mazingira Day'))
+        ->toEqual(CarbonImmutable::create(2024, 10, 10));
+
+    expect(formatDates($holidays))->toMatchSnapshot();
+});
+
+it('calculates October 10th holiday as Utamaduni Day in 2023', function () {
+    CarbonImmutable::setTestNow('2023-10-10');
+
+    $holidays = Holidays::for(country: 'ke')->get();
+
+    expect($holidays)
+        ->toBeArray()
+        ->not()->toBeEmpty();
+
+    expect(findDate($holidays, 'Utamaduni Day'))
+        ->toEqual(CarbonImmutable::create(2023, 10, 10));
+
+    expect(formatDates($holidays))->toMatchSnapshot();
+});
+
+it('calculates October 10th holiday as Huduma Day in 2021', function () {
+    CarbonImmutable::setTestNow('2021-10-10');
+
+    $holidays = Holidays::for(country: 'ke')->get();
+
+    expect($holidays)
+        ->toBeArray()
+        ->not()->toBeEmpty();
+
+    expect(findDate($holidays, 'Huduma Day'))
+        ->toEqual(CarbonImmutable::create(2021, 10, 10));
+
+    expect(formatDates($holidays))->toMatchSnapshot();
+});
+
+it('calculates October 10th holiday as Moi Day before 2019', function () {
+    CarbonImmutable::setTestNow('2018-10-10');
+
+    $holidays = Holidays::for(country: 'ke')->get();
+
+    expect($holidays)
+        ->toBeArray()
+        ->not()->toBeEmpty();
+
+    expect(findDate($holidays, 'Moi Day'))
+        ->toEqual(CarbonImmutable::create(2018, 10, 10));
+
+    expect(formatDates($holidays))->toMatchSnapshot();
+});