ignore dependabot PRs for additional reviewers action (#1372)

resolves action failing on dependabot compatibility:
#1371

can just stop triggering from dependabot PRs.

Author: adrian-kong

.github/workflows/add_additional_reviewers.yaml

@@ -8,6 +8,7 @@ jobs:
   auto-request-review:
     name: Add Additional Reviewers
     runs-on: ubuntu-latest
+    if: ${{ github.actor != 'dependabot[bot]' }}
     steps:
       - name: Request additional reviews based on supplied rules
         uses: necojackarc/auto-request-review@v0.10.0