Bump pygments from 2.19.2 to 2.20.0 in /docs

Bumps [pygments](https://github.com/pygments/pygments) from 2.19.2 to 2.20.0.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.19.2...2.20.0)

---
updated-dependencies:
- dependency-name: pygments
  dependency-version: 2.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -25,7 +25,7 @@ packaging==26.0
 paginate==0.5.7
 pathspec==1.0.4
 platformdirs==4.9.4
-Pygments==2.19.2
+Pygments==2.20.0
 pymdown-extensions==10.21
 pyparsing==3.3.2
 python-dateutil==2.9.0.post0