Bump pygments from 2.10.0 to 2.11.0 in /docs (#1201)

Bumps [pygments](https://github.com/pygments/pygments) from 2.10.0 to 2.11.0.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.10.0...2.11.0)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

docs/requirements.txt

@@ -9,7 +9,7 @@ sphinx-hoverxref==1.0.0
 recommonmark==0.7.1
 m2r2==0.3.2
 tomlkit==0.8.0
-pygments==2.10.0
+pygments==2.11.0
 
 # Dependencies of our project:
 typing-extensions==4.0.1