Set sdk_version for error_prone_core am: 91a4314704 am: 7647128ca3 am: cd2c4fb612

Original change: https://android-review.googlesource.com/c/platform/external/error_prone/+/2521118

Change-Id: I0070a1ef9fda88813141f767c4bc030e5d0a9b52
Signed-off-by: Automerger Merge Worker <[email protected]>