add djagno 6.0 to github actions CI

Author: dpgraham4401

.github/workflows/lint-and-test.yml

@@ -27,7 +27,7 @@ jobs:
     strategy:
       matrix:
         python_version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
-        django_version: ["4.2", "5.1", "5.2"]
+        django_version: ["4.2", "5.1", "5.2", "6.0"]
 
     runs-on: ubuntu-latest