packages/local_auth/local_auth_android/android/src/main/AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="io.flutter.plugins.localauth">
    <uses-sdk android:targetSdkVersion="29"/>
    <uses-permission android:name="android.permission.USE_BIOMETRIC" />
</manifest>