Bump pygments from 2.14.0 to 2.15.1 (#576)

Bumps [pygments](https://github.com/pygments/pygments) from 2.14.0 to 2.15.1.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.14.0...2.15.1)

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

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

docs-requirements.txt

@@ -32,7 +32,7 @@ packaging==23.1
     # via sphinx
 pycparser==2.21
     # via cffi
-pygments==2.14.0
+pygments==2.15.1
     # via sphinx
 pytz==2023.3
     # via babel