[automerger skipped] Update errorprone to 2.8.1 am: 002f6f6e8e -s ours

am skip reason: Merged-In I6ccba67fa3c92acc97c6cf526b86f01221a0bc5e with SHA-1 6a2721f766 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/error_prone/+/16214426

Change-Id: Icb3d8e790b86689b9325215cd3095cf59947c88c