dependency: (deps): bump pytz from 2024.1 to 2024.2 in /backend

Bumps [pytz](https://github.com/stub42/pytz) from 2024.1 to 2024.2.
- [Release notes](https://github.com/stub42/pytz/releases)
- [Commits](stub42/pytz@release_2024.1...release_2024.2)

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

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

backend/requirements.txt

@@ -15,7 +15,7 @@ Jinja2==3.1.4
 MarkupSafe==2.1.5
 openapi-codec==1.3.2
 packaging==24.1
-pytz==2024.1
+pytz==2024.2
 PyYAML==6.0.2
 requests==2.32.3
 simplejson==3.19.3