Bump pygments from 2.17.2 to 2.20.0 in /docs

Bumps [pygments](https://github.com/pygments/pygments) from 2.17.2 to 2.20.0.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.17.2...2.20.0)

---
updated-dependencies:
- dependency-name: pygments
  dependency-version: 2.20.0
  dependency-type: indirect
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -12,8 +12,6 @@ certifi==2024.7.4
     # via requests
 charset-normalizer==3.3.2
     # via requests
-colorama==0.4.6
-    # via sphinx
 docutils==0.20.1
     # via sphinx
 idna==3.7
@@ -26,7 +24,7 @@ markupsafe==2.1.3
     # via jinja2
 packaging==23.2
     # via sphinx
-pygments==2.17.2
+pygments==2.20.0
     # via sphinx
 requests==2.32.5
     # via