Fix release action

Author: steevanb

.github/workflows/release.yml

@@ -39,11 +39,9 @@ jobs:
                     delete-branch: true
             -
                 name: Merge pull request
-                uses: juliangruber/merge-pull-request-action@v1
-                with:
-                    github-token: ${{ secrets.GITHUB_TOKEN }}
-                    number: ${{ steps.create-pull-request.outputs.pull-request-number }}
-                    method: rebase
+                env:
+                    GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+                run: gh pr merge ${{ steps.create-pull-request.outputs.pull-request-number }} --rebase --delete-branch
             -
                 name: Create release
                 uses: softprops/action-gh-release@v2