Merge branch 'renovate/django-timezone-field-6.x' into 'main'

Update dependency django-timezone-field to v6

See merge request kif/akplanning!188

requirements.txt

@@ -3,7 +3,7 @@ django-bootstrap5==23.3
 fontawesomefree==6.4.2 # Makes static files (css, fonts) available locally
 django-fontawesome-6==1.0.0.0 # Provides an icon field for models and forms as well as handy shortcuts to render icons
 django-split-settings==1.2.0
-django-timezone-field==5.1
+django-timezone-field==6.0.1
 djangorestframework==3.14.0
 django-simple-history==3.4.0
 django-registration-redux==2.12