Update Django 6.1 dependency to stable release. (#10016)

Author: p-r-a-v-i-n

pyproject.toml

@@ -72,7 +72,7 @@ optional = [
 ]
 django52 = [ "django>=5.2,<6.0" ]
 django60 = [ "django>=6.0,<6.1" ]
-django61 = [ "django>=6.1rc1,<6.2" ]
+django61 = [ "django>=6.1,<6.2" ]
 djangomain = [ "django @ https://github.com/django/django/archive/main.tar.gz" ]
 
 [tool.setuptools]