Bump zipp from 3.20.2 to 3.21.0

Bumps [zipp](https://github.com/jaraco/zipp) from 3.20.2 to 3.21.0.
- [Release notes](https://github.com/jaraco/zipp/releases)
- [Changelog](https://github.com/jaraco/zipp/blob/main/NEWS.rst)
- [Commits](jaraco/zipp@v3.20.2...v3.21.0)

---
updated-dependencies:
- dependency-name: zipp
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

test_reqs.txt

@@ -2,7 +2,7 @@ Markdown==3.7  # pyup: <3.2
 coverage==7.6.4
 importlib_metadata<8.6
 typing_extensions==4.12.2
-zipp==3.20.2  # for flake8
+zipp==3.21.0  # for flake8
 flake8==7.1.1
 pep8==1.7.1
 pyflakes==3.2.0