(test): exclude django 6.1 alphas and betas from tox

Author: ericapisani

scripts/populate_tox/config.py

@@ -122,6 +122,7 @@
             "<3.1": ["pytest-django<4.0", "six"],
             "py3.14,py3.14t": ["coverage==7.11.0"],
         },
+        "include": "<6.1b1",
     },
     "dramatiq": {
         "package": "dramatiq",