Update python and django versions in tox.ini

Author: pauloxnet

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 envlist =
-       {py35,py36,py37}-django22,
+       {py36,py37,py38,py39}-django22,
        {py36,py37,py38,py39}-django31,
        {py36,py37,py38,py39,py310}-django32,
        {py38,py39,py310}-{django40,djangomain},
@@ -21,10 +21,10 @@ setenv =
        PYTHONDONTWRITEBYTECODE=1
        PYTHONWARNINGS=once
 deps =
-        django22: Django>=2.2,<3.0
-        django31: Django>=3.1,<3.2
-        django32: Django>=3.2,<4.0
-        django40: Django>=4.0,<5.0
+        django22: django~=2.2.17
+        django31: django~=3.1.3
+        django32: django~=3.2.9
+        django40: django~=4.0
         djangomain: https://github.com/django/django/archive/main.tar.gz
         -rrequirements/requirements-testing.txt
         -rrequirements/requirements-optionals.txt