Support for Django 4 (#101)

* Support for Django 4

* Change pytest-django version

* Change psycopg2 version

* Change pytest version

* Change tox version

* Change pytest-cov version

* Update circle ci jobs

* Fix ci jobs

* Update ci to postgres 12

* Allow Django 5.0

* Bump Django min version to 3.2

* Fix CI to account for >= 3.2 requirement

* Fix quote

* Remove python 3.12 for now due to distutils removal

* Remove Django upper bound

* Add back python3.6,3.7 wfs

* Downgrade dj-database-url

* Fix isnull issue from Django 4

setup.py

@@ -36,7 +36,7 @@ with open(
 
 setup(
     name="django-localized-fields",
-    version="6.8b3",
+    version="6.8b4",
     packages=find_packages(exclude=["tests"]),
     include_package_data=True,
     license="MIT License",
@@ -67,6 +67,8 @@ setup(
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
         "Topic :: Internet :: WWW/HTTP",
         "Topic :: Internet :: WWW/HTTP :: Dynamic Content",
     ],
@@ -80,14 +82,14 @@ setup(
         ':python_version <= "3.6"': ["dataclasses"],
         "docs": ["Sphinx==2.2.0", "sphinx-rtd-theme==0.4.3"],
         "test": [
-            "tox==3.14.3",
-            "pytest==5.3.2",
-            "pytest-django==3.7.0",
-            "pytest-cov==2.8.1",
+            "tox==3.28.0",
+            "pytest==7.0.1",
+            "pytest-django==4.5.2",
+            "pytest-cov==2.12.1",
             "dj-database-url==0.5.0",
-            "django-autoslug==1.9.6",
-            "django-bleach==0.6.1",
-            "psycopg2==2.8.4",
+            "django-autoslug==1.9.9",
+            "django-bleach==0.9.0",
+            "psycopg2==2.9.8",
         ],
         "analysis": [
             "black==22.3.0",