Since Android 12+ it is required to explicitly set the
android:exported property when the corresponding component
has an intent filter defined.
Fixes the following Android 12+ issue:
java.lang.IllegalArgumentException: com.app-xxx: Targeting S+
(version 31 and above) requires that one of FLAG_IMMUTABLE or
FLAG_MUTABLE be specified when creating a PendingIntent.
Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE
if some functionality depends on the PendingIntent being mutable,
e.g. if it needs to be used with inline replies or bubbles.