Bump zipp from 3.8.0 to 3.19.1 in /docs (#244)

Bumps [zipp](https://github.com/jaraco/zipp) from 3.8.0 to 3.19.1.
- [Release notes](https://github.com/jaraco/zipp/releases)
- [Changelog](https://github.com/jaraco/zipp/blob/main/NEWS.rst)
- [Commits](jaraco/zipp@v3.8.0...v3.19.1)

---
updated-dependencies:
- dependency-name: zipp
  dependency-version: 3.19.1
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Marcel Wallschläger <marcel.wallschlaeger@zalf.de>

Author: dependabot[bot]

docs/requirements.txt

@@ -62,5 +62,5 @@ six==1.16.0
     # via python-dateutil
 watchdog==2.1.9
     # via mkdocs
-zipp==3.8.0
+zipp==3.19.1
     # via importlib-metadata