Bump release-drafter/release-drafter from 5.18.1 to 5.21.1

Bumps [release-drafter/release-drafter](https://github.com/release-drafter/release-drafter) from 5.18.1 to 5.21.1.
- [Release notes](https://github.com/release-drafter/release-drafter/releases)
- [Commits](release-drafter/release-drafter@v5.18.1...v5.21.1)

---
updated-dependencies:
- dependency-name: release-drafter/release-drafter
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/release.yml

@@ -71,7 +71,7 @@ jobs:
           repository_url: https://test.pypi.org/legacy/
 
       - name: Publish the release notes
-        uses: release-drafter/release-drafter@v5.18.1
+        uses: release-drafter/release-drafter@v5.21.1
         with:
           publish: ${{ steps.check-version.outputs.tag != '' }}
           tag: ${{ steps.check-version.outputs.tag }}