fix(ci): Remove unit (3.7) from required checks

Author: chalmerlowe

.github/sync-repo-settings.yaml

@@ -11,7 +11,6 @@ branchProtectionRules:
     # No Kokoro:  the following are Github actions
     - 'mypy'
     - 'lint'
-    - 'unit (3.7)'
     - 'unit (3.8)'
     - 'unit (3.9)'
     - 'unit (3.10)'