chore: do not require reviews for material github bot (#11095)

Author: josephperrott

.github/angular-robot.yml

@@ -29,6 +29,8 @@ merge:
   checks:
     # whether the PR shouldn't have a conflict with the base branch
     noConflict: true
+    # whether the PR should have all reviews completed.
+    requireReviews: false
     # list of labels that a PR needs to have, checked with a regexp (e.g. "PR target:" will work for the label "PR target: master")
     requiredLabels:
       - "target: *"