Disable unused Python 2 variant. am: e90ad5e404 am: 7e6e982b8e

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

Change-Id: I19a7a111a69eadc8bc333e6f6b4a23f02ce16b19
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>