Support Google Play 16 KB Page Size Requirement (#13470)

- See: https://developer.android.com/guide/practices/page-sizes#update-packaging
- Also, make min API uniform at 21 (from 16 and 23 in a few places)

.github/workflows/release.yml

@@ -562,7 +562,7 @@ jobs:
         run: |
           python build-scripts/build-release.py \
             --actions android \
-            --android-api 23 \
+            --android-api 21 \
             --android-ndk-home "${{ steps.setup-ndk.outputs.ndk-path }}" \
             --commit ${{ inputs.commit }} \
             --root "${{ steps.tar.outputs.path }}" \