Bump pypa/cibuildwheel from 2.20 to 2.21 in the github-actions group (#33)

Author: dependabot[bot]

.github/workflows/reusable-python-packaging.yml

@@ -116,7 +116,7 @@ jobs:
           version: "latest"
           enable-cache: true
       # run cibuildwheel to build wheels for the specified Python version
-      - uses: pypa/cibuildwheel@v2.20
+      - uses: pypa/cibuildwheel@v2.21
       - name: Verify clean directory
         run: git diff --exit-code
         shell: bash
@@ -152,7 +152,7 @@ jobs:
           echo "CIBW_BEFORE_ALL_LINUX=/opt/python/cp311-cp311/bin/pip install z3-solver==${{ inputs.z3-version }}" >> $GITHUB_ENV
       # run cibuildwheel to build wheels for the specified Python version
       - name: Build wheels
-        uses: pypa/cibuildwheel@v2.20
+        uses: pypa/cibuildwheel@v2.21
         env:
           CIBW_ARCHS_LINUX: ${{ matrix.arch }}
           CIBW_TEST_SKIP: "cp*"