Bump pypa/cibuildwheel from 2.20 to 2.21

Bumps [pypa/cibuildwheel](https://github.com/pypa/cibuildwheel) from 2.20 to 2.21.
- [Release notes](https://github.com/pypa/cibuildwheel/releases)
- [Changelog](https://github.com/pypa/cibuildwheel/blob/main/docs/changelog.md)
- [Commits](pypa/cibuildwheel@v2.20...v2.21)

---
updated-dependencies:
- dependency-name: pypa/cibuildwheel
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/cibuildwheels.yml

@@ -68,7 +68,7 @@ jobs:
           arch: amd64
 
       - name: Build wheels
-        uses: pypa/cibuildwheel@v2.20
+        uses: pypa/cibuildwheel@v2.21
 
       - name: Upload wheels
         uses: actions/upload-artifact@v3