Disable unused Python 2 variant. am: e90ad5e404 am: 7e6e982b8e am: e679be899e am: 262cd32148

Original change: https://android-review.googlesource.com/c/platform/external/python/cachetools/+/2221305

Change-Id: I1158ef43db417f7e5c180102addcbc63ae350d5d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>