Trigger requirements run for requirements-py3.txt

The gate-.*requirements jobs are only triggered if certain files change.
Some projects have requirements-py3.txt or test-requirements-py3.txt.
Include as triggers all versions that the file update.py from the global
requirements repository handles.

Change-Id: Ib77229e7cc358059a6b3d6bcae0016959741db9d
Merge "Trigger requirements run for requirements-py3.txt"