ci: check that wheel metadata passes validation

Author: anthrotype

.github/workflows/wheels.yml

@@ -48,6 +48,8 @@ jobs:
         run: python -m pip install cibuildwheel
       - name: Build wheels
         run: python -m cibuildwheel --output-dir dist
+      - name: Check wheels metadata
+        run: pipx run twine check dist/*.whl
       - uses: actions/upload-artifact@v2
         with:
           path: dist/*.whl