Add janitors to the OWNERS file am: b2f47979d7

Original change: https://android-review.googlesource.com/c/platform/external/python/watchdog/+/3423988

Change-Id: I3a4659fbdee46ca68c95ffc72c2adf914a87b2da
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>