bump pypa/cibuildwheel from 2.19 to 2.20 in the actions group

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

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

.github/workflows/emscripten.yaml

@@ -20,7 +20,7 @@ jobs:
         submodules: true
         fetch-depth: 0
 
-    - uses: pypa/cibuildwheel@v2.19
+    - uses: pypa/cibuildwheel@v2.20
       env:
         PYODIDE_BUILD_EXPORTS: whole_archive
         CFLAGS: -fexceptions