Upgrade to Gradle 7.x and NDK r23b #3
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Upgrade to Android Gradle Plugin 7.0.3, Gradle 7.3, Android SDK Build Tools 30.0.2, set ndkVersion to 23.1.7779620 (r23b) and Java compatibility to VERSION_1_8.
The additions in app/build.gradle were done by Android Studio "File->Project Structure" dialog.
I built an APK release with android-studio-2020.3.1.25-windows on Windows 10. It was tested on my Android 7.0 (Samsung Galaxy S6 edge+) and Android 11 (Vivo X70 Pro+). Both look good.

FYI:
Android Gradle plugin release notes
Gradle Distributions
NDK Downloads
Cannot add task 'wrapper' as a task with that name already exists
How to specify source and target compatibility in Java module?