Update dependabot.yml

Author: narumiruna

.github/workflows/dependabot.yml

@@ -16,7 +16,7 @@ jobs:
         id: metadata
         uses: dependabot/fetch-metadata@v2
         with:
-          github-token: "${{ secrets.GH_TOKEN }}"
+          github-token: ${{ secrets.GH_TOKEN }}
       - name: Approve a PR
         run: gh pr review --approve "$PR_URL"
         env: