Bump uwsgi from 2.0.26 to 2.0.28 in /backend

Bumps [uwsgi](https://uwsgi-docs.readthedocs.io/en/latest/) from 2.0.26 to 2.0.28.

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

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

Author: dependabot[bot]

backend/pyproject.toml

@@ -56,7 +56,7 @@ dependencies = [
     "aniso8601==9.0.1",
     "whitenoise==6.7.0",
     "django-ordered-model==3.5",
-    "uWSGI==2.0.26",
+    "uWSGI==2.0.28",
     "django-storages==1.14.4",
     "sentry-sdk==2.11.0",
     "boto3==1.35.76",