CICD: Bump pypa/cibuildwheel from 2.20.0 to 2.21.0 (#119)

* CICD: Bump pypa/cibuildwheel from 2.20.0 to 2.21.0

Bumps [pypa/cibuildwheel](https://github.com/pypa/cibuildwheel) from 2.20.0 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@v2.20.0...v2.21.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Ralph Urlus <RUrlus@users.noreply.github.com>

.github/workflows/wheels.yml

@@ -81,7 +81,7 @@ jobs:
         cmake --build openmp_build --target install --config Release
 
     - name: Install cibuildwheel
-      run: python -m pip install cibuildwheel==2.18.0
+      run: python -m pip install cibuildwheel==2.21.0
 
     - name: Build wheels
       run: python -m cibuildwheel --output-dir wheelhouse
@@ -141,7 +141,7 @@ jobs:
             -DCMAKE_INSTALL_PREFIX="/usr/local"
         cmake --build openmp_build --target install --config Release
 
-    - uses: pypa/cibuildwheel@v2.20.0
+    - uses: pypa/cibuildwheel@v2.21.0
       env:
         # only build for x86_64, arm wheels are build seperately
         CIBW_ARCHS: "x86_64"