Bump Kotlin compiler to 2.3.21

[mcorner]

Summary:

Upgrade the Kotlin compiler version in the project to the latest public stable release (2.3.21).

• Addresses Request to upgrade Kotlin compiler #56522
• Bumped the Kotlin version from 2.2.0 to 2.3.21 in the central version catalogs of react-native and gradle-plugin.
• Upgraded the apiVersion target to KotlinVersion.KOTLIN_2_1 in all four gradle-plugin build files (shared, react-native-gradle-plugin, settings-plugin, shared-testutil) to resolve deprecation warnings for 2.0.
• Replaced the deprecated -Xjvm-default=all compiler option in ReactAndroid with -jvm-default=no-compatibility to avoid compilation errors under Kotlin 2.3.21.

Changelog:

[ANDROID] [CHANGED] - Bumped Kotlin version to 2.3.21 and Kotlin API version to 2.1

Test Plan:

Verified by running all local unit tests for both the Gradle plugin and the core Android library:

1. Gradle Included Build (gradle-plugin):
   • Executed ./gradlew test in packages/gradle-plugin.
   • Result: Build and all unit tests passed successfully; compilation is clean and free of API version 2.0 deprecation warnings.
2. Core Android Library (ReactAndroid):
   • Executed ./gradlew :packages:react-native:ReactAndroid:test in the root directory.
   • Result: Build and all unit tests passed successfully; compilation is clean and free of -Xjvm-default deprecation warnings.

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[mcorner]

I just saw: #56222. If that pull is going to happen, we don't need this, but one of them is needed to unblock our SDK wrapper for reCAPTCHA.

[meta-codesync]

@fabriziocucci has imported this pull request. If you are a Meta employee, you can view this in D105966180.

[mcorner]

Actually this change here: 62038cf is sufficient to unblock us (once it lands in some release). You can accept this if you want to go another version to 2.3.21

[fabriziocucci]

Actually this change here: 62038cf is sufficient to unblock us (once it lands in some release). You can accept this if you want to go another version to 2.3.21

That landed on main one week ago: see cb04956

The branch cut for 0.86 happened earlier so, unless we cherry pick it, it won't be included in that release.

I'll double-check internally whether we can make it.

[cortinico]

Upgrade the Kotlin compiler version in the project to the latest public stable release (2.3.21).

This can't be merged as is. React Native follows the same version of Kotlin that is used internally at Meta.

What's the reason why you want this bump? We recently bumped to 2.2.0 which should be source compatible with 2.3 also.

[cortinico]

That landed on main one week ago: see cb04956
The branch cut for 0.86 happened earlier so, unless we cherry pick it, it won't be included in that release.

This will land in 0.87 as the window to pick this inside 0.86 has closed + 0.86 will have no breaking changes (and this Kotlin bump is breaking instead).