Bump pytz from 2018.7 to 2024.2 in /docs

Bumps [pytz](https://github.com/stub42/pytz) from 2018.7 to 2024.2.
- [Release notes](https://github.com/stub42/pytz/releases)
- [Commits](stub42/pytz@release_2018.7...release_2024.2)

---
updated-dependencies:
- dependency-name: pytz
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -8,7 +8,7 @@ imagesize==0.7.1
 Jinja2==3.1.4
 MarkupSafe==0.23
 Pygments==2.15.0
-pytz==2018.7
+pytz==2024.2
 requests==2.32.3
 six==1.11.0
 snowballstemmer==1.2.1