chore: remove java7 units check from required checks in master (#515)

Author: Neenu1995

.github/sync-repo-settings.yaml

@@ -34,7 +34,6 @@ branchProtectionRules:
  - "linkage-monitor"
  - "lint"
  - "clirr"
- - "units (7)"
  - "units (8)"
  - "units (11)"
  - "Kokoro - Test: Integration"
@@ -46,4 +45,4 @@ permissionRules:
 - team: yoshi-java-admins
  permission: admin
 - team: yoshi-java
- permission: push
+ permission: push