Allow Dependabot to run PR Builder (#217)

[Dependabot PR builds
fail](#206) because
Dependabot is not whitelisted.

Author: JackPGreen

.github/workflows/pr-builder.yaml

@@ -27,7 +27,14 @@ jobs:
 
     steps:
       - name: Detect untrusted community PR
-        if: ${{ needs.check_for_membership.outputs.check-result == 'false' }}
+        if: >-
+          ${{ needs.check_for_membership.outputs.check-result == 'false' &&
+            (
+              github.actor != 'dependabot[bot]' &&
+              github.actor != 'renovate[bot]' &&
+              github.actor != 'mend[bot]'
+            )
+          }}
         run: |
           echo "::error::ERROR: Untrusted external PR. Must be reviewed and executed by Hazelcast" 1>&2;
           exit 1