Removing dj-22 and djmain from the tox config (#691)

Co-authored-by: Thomas de Jong <thomas.dejong@elements.nl>

tox.ini

@@ -1,9 +1,8 @@
 [tox]
 envlist=
-    py{37,38,39}-dj22-drf310-pyjwt{171,2}-tests
-    py{37,38,39,310}-dj{22,32}-drf{311,312,313}-pyjwt{171,2}-tests
-    py{38,39,310}-dj{40,41,main}-drf313-pyjwt{171,2}-tests
-    py311-dj{41,main}-drf313-pyjwt{171,2}-tests
+    py{37,38,39,310}-dj32-drf{311,312,313}-pyjwt{171,2}-tests
+    py{38,39,310}-dj{40,41}-drf313-pyjwt{171,2}-tests
+    py311-dj41-drf313-pyjwt{171,2}-tests
     docs
 
 [gh-actions]
@@ -43,7 +42,6 @@ deps=
     drf313: djangorestframework>=3.13,<3.14
     pyjwt171: pyjwt>=1.7.1,<1.8
     pyjwt2: pyjwt>=2,<3
-    djmain: https://github.com/django/django/archive/main.tar.gz
 allowlist_externals=make
 
 [testenv:docs]