chore(deps-dev): bump pygments from 2.18.0 to 2.20.0 in /docs

Bumps [pygments](https://github.com/pygments/pygments) from 2.18.0 to 2.20.0.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.18.0...2.20.0)

---
updated-dependencies:
- dependency-name: pygments
  dependency-version: 2.20.0
  dependency-type: direct:development
...

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

Author: dependabot[bot]

docs/requirements.dev.txt

@@ -29,7 +29,7 @@ more-itertools==10.3.0
 nh3==0.2.18
 packaging==24.1
 pkginfo==1.10.0
-Pygments==2.18.0
+Pygments==2.20.0
 python-dateutil==2.9.0.post0
 readme_renderer==43.0
 requests==2.32.3