build(deps): bump pygments from 2.12.0 to 2.15.0

Bumps [pygments](https://github.com/pygments/pygments) from 2.12.0 to 2.15.0.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.12.0...2.15.0)

---
updated-dependencies:
- dependency-name: pygments
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements-docs.txt

@@ -37,7 +37,7 @@ prompt-toolkit==3.0.30
 ptyprocess==0.7.0
 pure-eval==0.2.2
 pydata-sphinx-theme==0.8.1
-Pygments==2.12.0
+Pygments==2.15.0
 pyparsing==3.0.9
 pyrsistent==0.18.1
 python-dateutil==2.8.2