Merge branch '5.4' into 6.3

* 5.4:
  [String] Skip a test when an issue is detected in PCRE2
  [Mailer] Stop using the (local) AWS shared configuration in the PHPUnit tests.
  detect colors on not windows
  fix xterm detection
  refactor: hyper check
  Missing translations for Slovak (sk) #51954
  properly handle SYMFONY_DOTENV_VARS being the empty string
  Avoid incompatibility with symfony/console 7
  bug #45057 [Messenger] Avoid reconnecting active Redis connections.
  [Serializer] fix regression where nullable int cannot be serialized
  do not overwrite an application's default serialization context

Tests/AbstractUnicodeTestCase.php

@@ -92,14 +92,21 @@ public function testCodePointsAt(array $expected, string $string, int $offset, i
 
     public static function provideCodePointsAt(): array
     {
-        return [
+        $data = [
             [[], '', 0],
             [[], 'a', 1],
             [[0x53], 'Späßchen', 0],
             [[0xE4], 'Späßchen', 2],
             [[0xDF], 'Späßchen', -5],
-            [[0x260E], '☢☎❄', 1],
         ];
+
+        // Skip this set if we encounter an issue in PCRE2
+        // @see https://github.com/PCRE2Project/pcre2/issues/361
+        if (3 === grapheme_strlen('☢☎❄')) {
+            $data[] = [[0x260E], '☢☎❄', 1];
+        }
+
+        return $data;
     }
 
     public static function provideLength(): array