Disable unused Python 2 variant. am: f0dce18dba am: f1092dfe59 am: 5cf34b9b0b am: 882168550c am: 90c4b3d1b5

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

Change-Id: Ic12c25775e1067618b8dc02076433ee491b35e36
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>