Android build fails for AndroidTest with minSdkVersion 17 with react-native 0.64

[Merlier]

I'm using Detox for e2e tests and after upgrading to RN 0.64, the app detox build fails.
This issue could concern multiple modules. It's referenced here: wix/Detox#2712

The following command fails after upgrading to RN 0.64
./gradlew assembleDebug assembleAndroidTest -DtestBuildType=debug

With the following message:
`

Task :react-native-settings:processDebugAndroidTestManifest FAILED
[androidx.vectordrawable:vectordrawable-animated:1.0.0] /root/.gradle/caches/transforms-2/files-2.1/bb05b16f135343eba8fb88851c1f8ee9/vectordrawable-animated-1.0.0/AndroidManifest.xml Warning:
Package name 'androidx.vectordrawable' used in: androidx.vectordrawable:vectordrawable-animated:1.0.0, androidx.vectordrawable:vectordrawable:1.0.1.
See http://g.co/androidstudio/manifest-merger for more information about the manifest merger.
/builds/application-mobile/node_modules/react-native-settings/android/build/intermediates/tmp/manifest/androidTest/debug/manifestMerger1695351036710269372.xml:5:5-74 Error:
uses-sdk:minSdkVersion 16 cannot be smaller than version 21 declared in library [com.facebook.react:react-native:0.64.2] /root/.gradle/caches/transforms-2/files-2.1/83fdc6c83523d4af6406d02587819ec5/jetified-react-native-0.64.2/AndroidManifest.xml as the library might be using APIs not available in 16
Suggestion: use a compatible library with a minSdk of at most 16,
or increase this project's minSdk version to at least 21,
or use tools:overrideLibrary="com.facebook.react" to force usage (may lead to runtime failures)
`

I looked for several solutions but the easiest would be to update the gradle android config of react-native-settings, inspired from other gradle file of module like: https://github.com/react-native-async-storage/async-storage/blob/master/android/build.gradle

[Merlier]

I pushed a PR to fix this issue. #83