Rename Django's dev branch to main.

More information: https://groups.google.com/g/django-developers/c/tctDuKUGosc/
Refs: https://github.com/django/django/pull/14048

.github/workflows/test.yml

@@ -17,13 +17,13 @@ jobs:
             django-version: 'qa'
           # Django >= 3.2 only supports >= Python 3.8
           - python-version: '3.8'
-            django-version: 'dev'
+            django-version: 'main'
             experimental: true
           - python-version: '3.9'
-            django-version: 'dev'
+            django-version: 'main'
             experimental: true
           - python-version: 'pypy3'
-            django-version: 'dev'
+            django-version: 'main'
             experimental: true
 
     steps:

pyproject.toml

@@ -11,7 +11,7 @@ legacy_tox_ini = """
 [tox]
 envlist =
     py{36,37,38,39,py3}-dj{22,30,31}
-    py{38,39}-dj{dev}
+    py{38,39}-djmain
     py38-djqa
 
 [gh-actions]
@@ -27,7 +27,7 @@ DJANGO =
     2.2: dj22
     3.0: dj30
     3.1: dj31
-    dev: djdev
+    main: djmain
     qa: djqa
 
 # Normal test environment runs pytest which orchestrates other tools
@@ -37,14 +37,14 @@ deps =
     dj22: django>=2.2,<2.3
     dj30: django>=3.0,<3.1
     dj31: django>=3.1,<3.2
-    djdev: https://github.com/django/django/archive/master.tar.gz
+    djmain: https://github.com/django/django/archive/main.tar.gz
 usedevelop = true
 commands = pytest
 setenv =
     PYTHONDONTWRITEBYTECODE=1
 
 # Django development version is allowed to fail the test matrix
-[testenv:py{38,39,py3}-dj{dev}]
+[testenv:py{38,39,py3}-djmain]
 ignore_errors = true
 ignore_outcome = true