Bump pypa/cibuildwheel from 2.20.0 to 2.21.0 (#1847)

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

.github/workflows/publish_dartpy.yml

@@ -124,7 +124,7 @@ jobs:
 
       - name: Build wheels
         if: ${{ matrix.os != 'windows-latest' && (matrix.release_only == false || github.ref == 'refs/heads/main') }}
-        uses: pypa/cibuildwheel@v2.20.0
+        uses: pypa/cibuildwheel@v2.21.0
         env:
           # macOS
           MACOSX_DEPLOYMENT_TARGET: 14.0
@@ -134,7 +134,7 @@ jobs:
 
       - name: Build wheels (Windows)
         if: ${{ matrix.os == 'windows-latest' && (matrix.release_only == false || github.ref == 'refs/heads/main') }}
-        uses: pypa/cibuildwheel@v2.20.0
+        uses: pypa/cibuildwheel@v2.21.0
         env:
           # macOS
           MACOSX_DEPLOYMENT_TARGET: 14.0