fix(Android): minSdkVersion fallback to default 21 but RN 0.74 requir…

…e minSdkVersion 23 (#2346)

## Description
This PR is a potential fix for
[#2295](#2295).
Following suggestions in
[PR#2251](#2251 (comment))
and Android Gradle Plugin version 7.0.0 changes: `minSdkVersion` was
renamed to `minSdk`, `targetSdkVersion` was renamed to `targetSdk`,
`compileSdkVersion` was renamed to `compileSdk`, this PR ensures
compatibility with react native integrated with newest Android projects.

Fixes #2295

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Fixes # .
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## Changes
In `adroid/build.gradle` file to get value for `minSdkVersion` in
`defaultConfig` it will look for `minSdkVersion` in rootProject then
look for `minSdk` and then fallback to default. Previously it looked for
`minSdkVersion` and fallback if not found.
Similar logic for `targetSdkVersion` and `compileSdkVersion`
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- Updated `about.md` docs

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## Test code and steps to reproduce

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## Checklist

- [ ] Included code example that can be used to test this change
- [ ] Updated TS types
- [ ] Updated documentation: <!-- For adding new props to native-stack
-->
- [ ]
https://github.com/software-mansion/react-native-screens/blob/main/guides/GUIDE_FOR_LIBRARY_AUTHORS.md
- [ ]
https://github.com/software-mansion/react-native-screens/blob/main/native-stack/README.md
- [ ]
https://github.com/software-mansion/react-native-screens/blob/main/src/types.tsx
- [ ]
https://github.com/software-mansion/react-native-screens/blob/main/src/native-stack/types.tsx
- [ ] Ensured that CI passes

android/build.gradle

@@ -9,7 +9,11 @@ buildscript {
         rnsDefaultKotlinVersion = '1.8.0'
     }
     ext.safeExtGet = {prop, fallback ->
-        rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback
+        def props = (prop instanceof String) ? [prop] : prop
+        def result = props.find { key ->
+            return rootProject.ext.has(key)
+        }
+        return result ? rootProject.ext.get(result) : fallback
     }
     repositories {
         google()
@@ -77,8 +81,8 @@ android {
     }
 
     defaultConfig {
-        minSdkVersion safeExtGet('minSdkVersion', rnsDefaultMinSdkVersion)
-        targetSdkVersion safeExtGet('targetSdkVersion', rnsDefaultTargetSdkVersion)
+        minSdkVersion safeExtGet(['minSdkVersion', 'minSdk'], rnsDefaultMinSdkVersion)
+        targetSdkVersion safeExtGet(['targetSdkVersion', 'targetSdk'], rnsDefaultTargetSdkVersion)
         versionCode 1
         versionName "1.0"
         buildConfigField "boolean", "IS_NEW_ARCHITECTURE_ENABLED", IS_NEW_ARCHITECTURE_ENABLED.toString()
@@ -136,7 +140,7 @@ android {
             }
         }
         res {
-            if (safeExtGet('compileSdkVersion', rnsDefaultCompileSdkVersion) >= 33) {
+            if (safeExtGet(['compileSdkVersion', 'compileSdk'], rnsDefaultCompileSdkVersion) >= 33) {
                 srcDirs = ["${androidResDir}/base", "${androidResDir}/v33"]
             } else {
                 srcDirs = ["${androidResDir}/base"]