Allow PR builder on dependabot PRs

hazelcast#1360 is blocked by lack of PR builder execution.

[Fixed in a _similar_ way to `hazelcast-code-samples`](https://github.com/hazelcast/hazelcast-code-samples/blob/94133f7b918259f0e89cc9ddc8bc16050ce77bc0/.github/workflows/builder.yaml#L24-L28).

Author: JackPGreen

.github/workflows/build-pr.yml

@@ -50,19 +50,19 @@ jobs:
           member-name: ${{ github.actor }}
           token: ${{ secrets.GH_TOKEN }}
 
-  # ensure we are an Hazelcast organization member OR manually running
+  # ensure PR is trusted
   ensure-membership:
     name: Ensure Membership
     runs-on: ubuntu-latest
     needs: test-membership
     strategy:
       fail-fast: false    
 
-    if: needs.test-membership.outputs.is-hazelcast == 'true' || github.event_name == 'workflow_dispatch'
+    if: ${{ needs.test-membership.outputs.is-hazelcast == 'true' || github.event_name == 'workflow_dispatch' || github.actor == 'dependabot[bot]' }}
     steps:
       - name: Report
         shell: bash
-        run: echo "User ${{ github.actor }} is a member of the Hazelcast organization"          
+        run: echo "User ${{ github.actor }} is trusted for PR execution"          
 
 
   # get