Disable unused Python 2 variant. am: f0dce18dba am: f1092dfe59 am: 5cf34b9b0b

Original change: https://android-review.googlesource.com/c/platform/external/python/google-api-python-client/+/2221330

Change-Id: Id7ef3f19d101a612f4824f1d53452ba91158e1b0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>