Bump pytz from 2022.6 to 2022.7

Bumps [pytz](https://github.com/stub42/pytz) from 2022.6 to 2022.7.
- [Release notes](https://github.com/stub42/pytz/releases)
- [Commits](stub42/pytz@release_2022.6...release_2022.7)

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

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

requirements/base.txt

@@ -11,7 +11,7 @@ djangorestframework==3.14.0
 gunicorn==20.1.0
 gviz_api==1.10.0
 psycopg2-binary==2.9.5
-pytz==2022.6
+pytz==2022.7
 static==1.1.1
 whitenoise[brotli]==6.2.0
 future==0.18.2