build(deps): bump pygments from 2.14.0 to 2.16.1 in /docs

Bumps [pygments](https://github.com/pygments/pygments) from 2.14.0 to 2.16.1.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.14.0...2.16.1)

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

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

docs/requirements.txt

@@ -1,5 +1,5 @@
 furo==2023.5.20
-pygments==2.14.0
+pygments==2.16.1
 sphinx==7.0.1
 sphinx-copybutton==0.5.1
 sphinx-inline-tabs==2022.1.2b11