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>

requirements.txt

@@ -123,7 +123,7 @@ inflection>=0.4.0
 jdcal==1.4.1
 mock<5.0.0
 python-dateutil==2.8.2
-pytz==2022.2.1
+pytz==2022.4
 requests==2.28.1
 timeout-decorator==0.5.0
 pylibmc==1.6.3