Merge "update mainline branch reminder from T to U" into main am: 01f625c0

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2901086



Change-Id: I131a1d37158ba4b18a82650d8ecf42621f4d415f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>