dependabot-auto-merge: Use github.token instead of secrets.GITHUB_TOKEN (#69)

Author: tangrufus

.github/workflows/dependabot-auto-merge.yml

@@ -24,12 +24,12 @@ jobs:
         id: dependabot-metadata
         uses: dependabot/fetch-metadata@25dd0e34f4fe68f24cc83900b1fe3fe149efef98 # v3.1.0
         with:
-          github-token: "${{ secrets.GITHUB_TOKEN }}"
+          github-token: "${{ github.token }}"
 
       - if: |
           (steps.dependabot-metadata.outputs.update-type == 'version-update:semver-minor')
           || (steps.dependabot-metadata.outputs.update-type == 'version-update:semver-patch')
         run: gh pr merge --auto --squash "$PR_URL"
         env:
-          PR_URL: ${{github.event.pull_request.html_url}}
-          GH_TOKEN: ${{secrets.GITHUB_TOKEN}}
+          PR_URL: ${{ github.event.pull_request.html_url }}
+          GH_TOKEN: ${{ github.token }}