Bump django-ses from 4.1.1 to 4.3.1 in /backend

Bumps [django-ses](https://github.com/django-ses/django-ses) from 4.1.1 to 4.3.1.
- [Release notes](https://github.com/django-ses/django-ses/releases)
- [Changelog](https://github.com/django-ses/django-ses/blob/main/CHANGES.md)
- [Commits](django-ses/django-ses@v4.1.1...v4.3.1)

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

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

Author: dependabot[bot]

backend/pyproject.toml

@@ -62,7 +62,7 @@ dependencies = [
     "boto3==1.35.76",
     "pycountry<20.0,>=19.8",
     "countries<1.0.0,>=0.2.0",
-    "django-ses==4.1.1",
+    "django-ses==4.3.1",
     "hashids<2.0.0,>=1.2.0",
     "django-autocomplete-light==3.9.4",
     "django-queryinspect<2.0.0,>=1.1.0",