build(deps): bump pytz in /docs in the production-dependencies group (#4425)

Bumps the production-dependencies group in /docs with 1 update: [pytz](https://github.com/stub42/pytz).


Updates `pytz` from 2026.1.post1 to 2026.2
- [Release notes](https://github.com/stub42/pytz/releases)
- [Commits](stub42/pytz@release_2026.1.post1...release_2026.2)

---
updated-dependencies:
- dependency-name: pytz
  dependency-version: '2026.2'
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: production-dependencies
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -12,7 +12,7 @@ imagesize==2.0.0
 myst-parser==5.0.0 
 packaging==26.2
 pyparsing==3.3.2
-pytz==2026.1.post1
+pytz==2026.2
 requests==2.33.1
 snowballstemmer==3.0.1
 sphinx-favicon==1.1.0