Merge branch 'renovate/django-phonenumber-field-4.x' into 'master'

Update dependency django-phonenumber-field to v4

See merge request BiscuIT/BiscuIT-ng!70

pyproject.toml

@@ -30,7 +30,7 @@ django-middleware-global-request = "^0.1.2"
 django-menu-generator = "^1.0.4"
 django-tables2 = "^2.1"
 Pillow = "^6.1"
-django-phonenumber-field = {version = "^3.0", extras = ["phonenumbers"]}
+django-phonenumber-field = {version = "^4.0", extras = ["phonenumbers"]}
 django-sass-processor = "^0.7.3"
 libsass = "^0.19.2"
 colour = "^0.1.5"