Add janitors to the OWNERS file am: 5751a09774

Original change: https://android-review.googlesource.com/c/platform/external/google-auth-library-java/+/3423692

Change-Id: I3dacb5ba49386bb8d42d9848988c9d947480a1a8
Signed-off-by: Automerger Merge Worker <[email protected]>