Bump pytz from 2023.3 to 2023.3.post1

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>

requirements/base.txt

@@ -14,7 +14,7 @@ drf-spectacular-sidecar==2023.9.1
 gunicorn==21.2.0
 gviz_api==1.10.0
 psycopg2-binary==2.9.7
-pytz==2023.3
+pytz==2023.3.post1
 static==1.1.1
 whitenoise[brotli]==6.5.0
 pygments==2.16.1