DEP(deps): Update pytz requirement

Updates the requirements on [pytz](https://github.com/stub42/pytz) to permit the latest version.
- [Release notes](https://github.com/stub42/pytz/releases)
- [Commits](stub42/pytz@release_2021.3...release_2026.1.post1)

---
updated-dependencies:
- dependency-name: pytz
  dependency-version: 2026.1.post1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -12,7 +12,7 @@ requests>=2.27.1,<2.34.0
 six>=1.16,<1.18
 cachetools>=5.0,<7.1
 pycryptodome>=3.13,<3.24
-pytz>=2021.3,<2027.0
+pytz>=2026.1.post1,<2027.0
 confuse>=1.7,<2.3
 python-dotenv
 pyyaml