bug(ci): fix dependabot reviewer assignment

Author: dshemetov

.github/workflows/dependabot-assignments.yml

@@ -7,11 +7,11 @@ permissions:
 jobs:
   dependabot:
     runs-on: ubuntu-latest
-    env: 
-        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    env:
+      GH_TOKEN: ${{ secrets.CMU_DELPHI_AUTOMATION_MACHINE_DEPENDABOT_PAT }}
     if: ${{ github.actor == 'dependabot[bot]' }}
     steps:
       - name: Assign team to PR
         run: gh pr edit "$PR_URL" --add-reviewer "cmu-delphi/code-reviewers"
         env:
-          PR_URL: ${{github.event.pull_request.html_url}}
+          PR_URL: ${{github.event.pull_request.html_url}}