[jni] chore: bump compileSdk

[lsaudon]

• Bump compileSdk to have the same version as flutter.compileSdkVersion
• chore: best effort is dropped Updating the supported platforms page flutter/website#11271

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[dcharkes]

Thanks @lsaudon ! 🙏

LGTM to the native_toolchain_c changes. 👍

@HosseinYousefi would you please review the JNIgen changes?

[github-actions]

PR Health

Breaking changes ⚠️

Package	Change	Current Version	New Version	Needed Version	Looking good?
jni	Breaking	0.14.1	0.14.1	0.15.0 Got "0.14.1" expected >= "0.15.0" (breaking changes)	⚠️

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API leaks ⚠️

The following packages contain symbols visible in the public API, but not exported by the library. Export these symbols or remove them from your publicly visible API.

Package	Leaked API symbols
jni	_ReferenceType _opaque_pthread_mutex_t _opaque_pthread_cond_t _Dart_FinalizableHandle

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pkgs/jni/lib/src/third_party/generated_bindings.dart
pkgs/objective_c/lib/src/ns_input_stream.dart

[coveralls]

coverage: 85.975%. first build
when pulling 0feddcf on lsaudon:chore/bump-compilesdk
into 8c39c95 on dart-lang:main.