Update errorprone to v2.15.0 am: 1e28b2a555 am: 5fb6e8ece3 am: 72275261d1 am: 29e013d3cf

Original change: https://android-review.googlesource.com/c/platform/external/error_prone/+/2214835

Change-Id: I4b1898c7bfd5adac345db03f83a2b1b6390e1daa
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>