Bump pytz from 2023.3 to 2023.3.post1 (#871)

Bumps [pytz](https://github.com/stub42/pytz) from 2023.3 to 2023.3.post1.
- [Commits](stub42/pytz@release_2023.3...release_2023.3.post1)

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

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

Author: dependabot[bot]

requirements.txt

@@ -9,7 +9,7 @@ pyIsEmail==2.0.1
 GitPython==3.1.32
 xmltodict==0.13.0
 lxml==4.9.3
-pytz==2023.3
+pytz==2023.3.post1
 tzlocal==4.1
 markdown2==2.4.10
 flask-migrate==4.0.4