fix: solve issue that sdk can not be compiled on android platform

[0xWOF]

Summary

1. Flutter app project using Amplitude-Flutter cannot be compiled with flutter bulid apk command on build machine that Flutter 3.24.0 or later is installed.
2. Cause of problem is Flutter 3.24.0 upgrades AndroidX dependencies that requires compileSdkVersion 31. (Amplitude-Flutter use 28 as compileSdkVersion)
3. It cannot be fixed with modification on flutter app project only.
4. It can be fixed with modification on flutter app project and Amplitude-Flutter both. (Set compileSdkVersion to 31 or later)
5. This pull request set Amplitude-Flutter's compileSdkVersion to 31.

Why?

Flutter app project using Amplitude-Flutter cannot be compiled with flutter bulid apk command on build machine that Flutter 3.24.0 or later is installed.
Because on Flutter 3.24.0, it upgrades AndroidX dependencies that requires compileSdkVersion 31 but Amplitude-Flutter use 28.
To fix this issue Amplitude-Flutter should change compileSdkVersion to 31 or later.
Change compileSdkVersion to 31 or later on flutter app project do not fix the problem.

How to reproduce problem?

Run command below.

flutter upgrade
flutter create test_amplitude --platform android
cd test_amplitude
flutter pub add amplitude_flutter
flutter pub get
flutter build apk

Then below error is occurred

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':amplitude_flutter:verifyReleaseResources'.
> A failure occurred while executing com.android.build.gradle.tasks.VerifyLibraryResourcesTask$Action
   > Android resource linking failed
     ERROR:/{YOUR_PATH}/test_amplitude/build/amplitude_flutter/intermediates/merged_res/release/values/values.xml:206: AAPT: error: resource android:attr/lStar not found.


* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 16s
Running Gradle task 'assembleRelease'...                           17.4s
Gradle task assembleRelease failed with exit code 1

Cause of problem

Flutter 3.24.0 upgrades AndroidX dependencies that requires compileSdkVersion 31.
Refer comment from Flutter issue flutter/flutter#153281 (comment).

Solution

Update Amplitude-Flutter's compileSdkVersion to 31.

[louisdeveseleer]

I have the same issue descrribed with Futter 3.24.0 and I confirm that applying the fix proposed (amplitude_flutter compileSdkVersion set to 31) fixes the issue.

[github-actions]

🎉 This PR is included in version 3.16.3 🎉

The release is available on GitHub release

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