Bump pytz from 2022.2.1 to 2022.4

Bumps [pytz](https://github.com/stub42/pytz) from 2022.2.1 to 2022.4.
- [Release notes](https://github.com/stub42/pytz/releases)
- [Commits](https://github.com/stub42/pytz/commits)

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

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

Author: dependabot[bot]

requirements.txt

@@ -44,7 +44,7 @@ python-dateutil==2.8.2
     # via
     #   matplotlib
     #   pandas
-pytz==2022.2.1
+pytz==2022.4
     # via pandas
 pyyaml==6.0
     # via