[Android] Increase API level.

[RokeJulianLockhart]

Currently, Kitsu targets API level 27. Since A14 is removing support for A23, and due to the age of Android 8, inability to install anything below API level 28 to 31-ish isn't infeasible. Regardless, it's a significant inconsistency that'll become technical debt in every sense of the world shortly. Consequently, it should be raised.

1. https://apilevels.com/
2. https://bayton.org/android/android-14-minimum-sdk/