ci: add automerge dependencies to the next release milestone (#240)

Author: zimeg

.github/workflows/dependencies.yml

@@ -17,6 +17,12 @@ jobs:
         uses: dependabot/fetch-metadata@08eff52bf64351f401fb50d4972fa95b9f2c2d1b # v2.4.0
         with:
           github-token: "${{ secrets.GITHUB_TOKEN }}"
+      - name: Milestone
+        if: steps.metadata.outputs.update-type == 'version-update:semver-patch' || steps.metadata.outputs.update-type == 'version-update:semver-minor'
+        run: gh pr edit --milestone "Next Release" "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GH_TOKEN: ${{secrets.GITHUB_TOKEN}}
       - name: Approve
         if: steps.metadata.outputs.update-type == 'version-update:semver-patch' || steps.metadata.outputs.update-type == 'version-update:semver-minor'
         run: gh pr review --approve "$PR_URL"