Bump pypa/cibuildwheel from 2.19.1 to 2.21.0

Bumps [pypa/cibuildwheel](https://github.com/pypa/cibuildwheel) from 2.19.1 to 2.21.0.
- [Release notes](https://github.com/pypa/cibuildwheel/releases)
- [Changelog](https://github.com/pypa/cibuildwheel/blob/main/docs/changelog.md)
- [Commits](pypa/cibuildwheel@v2.19.1...v2.21.0)

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

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

.github/workflows/pythonpackage.yml

@@ -43,7 +43,7 @@ jobs:
       with:
         platforms: all    
     - name: Build wheels
-      uses: pypa/cibuildwheel@v2.19.1
+      uses: pypa/cibuildwheel@v2.21.0
       env:
         CIBW_ARCHS_MACOS: x86_64 arm64 universal2
         CIBW_ARCHS_LINUX: auto aarch64