Disable unused Python 2 variant. am: c2665c9956 am: cacd92c6ca am: cf033b4835

Original change: https://android-review.googlesource.com/c/platform/external/python/python-api-core/+/2221803

Change-Id: I79dc4cba6400923079d7e689dc12e1a7b939bba8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>