add django 4.1 to workflow

Author: bckohan

.github/workflows/test.yml

@@ -15,6 +15,8 @@ jobs:
         exclude:
           - python-version: '3.7'
             django-version: 'Django~=4.0.0'
+          - python-version: '3.7'
+            django-version: 'Django~=4.1.0'
 
     steps:
     - uses: actions/checkout@v2