multiple_maps - Android: Fix minSdkVersion 19 cannot be smaller than version 21

[GitToTheHub]

When you make a fresh Cordova app, add this plugin and build it, there will be the error:

.../hello/platforms/android/app/src/main/AndroidManifest.xml Error:
        uses-sdk:minSdkVersion 19 cannot be smaller than version 21 declared in library [androidx.core:core-splashscreen:1.0.0] .../.gradle/caches/transforms-4/34c2c9227e2d15c94d4f3d9edef35ec8/transformed/jetified-core-splashscreen-1.0.0/AndroidManifest.xml as the library might be using APIs not available in 19
        Suggestion: use a compatible library with a minSdk of at most 19,
                or increase this project's minSdk version to at least 21,
                or use tools:overrideLibrary="androidx.core.splashscreen" to force usage (may lead to runtime failures)

See https://developer.android.com/r/studio-ui/build/manifest-merger for more information about the manifest merger.

this is fixed, by setting minSdk to 21 in plugin.xml