Remove redundant trove classifier

Declaring major version is more a of Python 2 vs 3 thing and not useful for Django

Author: ulgens

pyproject.toml

@@ -31,7 +31,6 @@ classifiers = [
     "Framework :: Django :: 5.0",
     "Framework :: Django :: 5.1",
     "Framework :: Django :: 5.2",
-    "Framework :: Django :: 6",
     "Framework :: Django :: 6.0"
 ]