Remove Django main branch from test matrix

Author: 2ykwang

.github/workflows/test.yml

@@ -15,24 +15,14 @@ jobs:
       fail-fast: false
       max-parallel: 5
       matrix:
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
-        django-version: ['2.2', '3.2', '4.0', '4.1', 'main']
+        python-version: ['3.7', '3.8', '3.9', '3.10']
+        django-version: ['2.2', '3.2', '4.0', '4.1']
         drf-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
         exclude:
-          - python-version: '3.7'
-            django-version: 'main'
           - python-version: '3.10'
             django-version: '2.2'
           - django-version: '2.2'
             drf-version: '3.14'
-          - django-version: 'main'
-            drf-version: '3.10'
-          - django-version: 'main'
-            drf-version: '3.11'
-          - django-version: 'main'
-            drf-version: '3.12'
-          - django-version: 'main'
-            drf-version: '3.13'
 
     steps:
     - uses: actions/checkout@v2