fix: Add condition to skip assignee for dependabot

Author: mfranzke

.github/workflows/auto-assign.yml

@@ -15,6 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions-ecosystem/action-add-assignees@v1
+        if: ${{ github.actor != 'dependabot[bot]' }}
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           assignees: ${{ github.actor }}