Merge branch 'renovate/django-4.x' into 'main'

Update dependency Django to v4.2.3

See merge request kif/akplanning!178

requirements.txt

-Django==4.2.1
+Django==4.2.3
 django-bootstrap5==23.1
 fontawesomefree==6.4.0 # 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