Bump github/combine-prs from 5.0.0 to 5.1.0

Bumps [github/combine-prs](https://github.com/github/combine-prs) from 5.0.0 to 5.1.0.
- [Release notes](https://github.com/github/combine-prs/releases)
- [Commits](github/combine-prs@v5.0.0...v5.1.0)

---
updated-dependencies:
- dependency-name: github/combine-prs
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/combine-prs.yml

@@ -11,6 +11,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: combine-prs
-        uses: github/combine-prs@v5.0.0
+        uses: github/combine-prs@v5.1.0
         with:
           github_token: ${{ secrets.GH_TOKEN }}