Disable unused Python 2 variant. am: 5933c383ef

Original change: https://android-review.googlesource.com/c/platform/external/python/uritemplates/+/2221335

Change-Id: I3c6d4215eca184c5c048b689301326c820fcd126
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>