Bump black from 23.3.0 to 23.7.0

Bumps [black](https://github.com/psf/black) from 23.3.0 to 23.7.0.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@23.3.0...23.7.0)

---
updated-dependencies:
- dependency-name: black
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

setup.py

@@ -36,7 +36,7 @@
     py_modules=["xml_sitemap_writer"],
     extras_require={
         "dev": [
-            "black==23.3.0",
+            "black==23.7.0",
             "coveralls==3.3.1",
             "pylint==2.17.4",
             "pytest==7.4.0",