Update pytz requirement from ~=2022.7 to ~=2023.2 (#538)

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_2022.7...release_2023.2)

---
updated-dependencies:
- dependency-name: pytz
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Mila Page <[email protected]>

dev-requirements.txt

@@ -23,7 +23,7 @@ pytest-csv~=3.0
 pytest-dotenv~=0.5.2
 pytest-logbook~=1.2
 pytest-xdist~=3.2
-pytz~=2022.7
+pytz~=2023.2
 tox~=3.0;python_version=="3.7"
 tox~=4.4;python_version>="3.8"
 types-pytz~=2023.2