Bump django-s3sign from 0.4.0 to 0.5.1

Bumps [django-s3sign](https://github.com/ccnmtl/django-s3sign) from 0.4.0 to 0.5.1.
- [Release notes](https://github.com/ccnmtl/django-s3sign/releases)
- [Changelog](https://github.com/ccnmtl/django-s3sign/blob/master/CHANGES)
- [Commits](ccnmtl/django-s3sign@0.4.0...0.5.1)

---
updated-dependencies:
- dependency-name: django-s3sign
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -2,7 +2,7 @@ Django>=4.2.14,<5
 psycopg[binary]==3.2.1
 backports.zoneinfo;python_version<"3.9"
 asgiref==3.8.1
-django-s3sign==0.4.0
+django-s3sign==0.5.1
 pytz==2025.1
 httplib2==0.22.0
 feedparser==6.0.8