Bump API_LEVEL so we can use androidx prebuilts am: ff4f656ad5 am: 2858714850 am: 8a8f98ce64 am: 1f17653032 am: b95f678339

Original change: https://android-review.googlesource.com/c/platform/tools/metalava/+/2061258

Change-Id: I81a17ebbaded27b5ac8b05d3405e4ddeb9fd0554
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>