Bump django from 4.2.16 to 5.1.1

Bumps [django](https://github.com/django/django) from 4.2.16 to 5.1.1.
- [Commits](django/django@4.2.16...5.1.1)

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

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

base-requirements.txt

@@ -4,7 +4,7 @@ django-sitetree==1.18.0  # >=1.17.1 is (?) first version that supports Django 4.
 django-apptemplates==1.5
 django-admin-interface==0.24.2
 django-translation-aliases==0.1.0
-Django==4.2.16
+Django==5.1.1
 docutils==0.21.2
 Markdown==3.7
 cmarkgfm==0.6.0