deps: update django to 5.1.5

Author: shn-liqd

requirements/base.txt

@@ -1,5 +1,5 @@
 # A4
-git+https://github.com/liqd/adhocracy4.git@aplus-v2501.1.2#egg=adhocracy4
+git+https://github.com/liqd/adhocracy4.git@aplus-v2508.4#egg=adhocracy4
 
 # Additional requirements
 brotli==1.1.0
@@ -17,14 +17,14 @@ urllib3==2.3.0
 redis==5.2.1
 
 # Inherited a4-core requirements
-Django==4.2.18
-django-allauth[socialaccount]==65.3.1
+Django==5.1.5
+django-allauth==65.3.1
 django-autoslug==1.9.9
 https://github.com/liqd/django-ckeditor-5/releases/download/v0.2.12-liqd/django_ckeditor_5-0.2.12-py3-none-any.whl
 django-filter==24.3
 django-widget-tweaks==1.5.0
 djangorestframework==3.15.2
-easy-thumbnails[svg]==2.10
+easy-thumbnails==2.10
 jsonfield==3.1.0
 python-magic==0.4.27
 python-dateutil==2.9.0.post0