misc: drop Django 4 pin to add support (#13)

Author: Gustavo Silva

setup.cfg

@@ -26,7 +26,7 @@ zip_safe = False
 include_package_data = True
 packages = find:
 install_requires =
-    Django >= 3.0, < 4.0
+    Django >= 3.0, < 5.0
 python_requires = >=3.7
 
 [options.packages.find]