chore(tests): import pendulum in base tests (#19067)

* chore(ci): no class level freezegun

* surely this isn't the way

* import pendulum for sideeffect

* Revert "surely this isn't the way"

This reverts commit eaa2f1a.

* Revert "chore(ci): no class level freezegun"

This reverts commit c274de9.

* try and stop ruff deleting the line on commit

posthog/test/base.py

@@ -10,6 +10,10 @@
 from unittest.mock import patch
 
 import freezegun
+
+# we have to import pendulum for the side effect of importing it
+# freezegun.FakeDateTime and pendulum don't play nicely otherwise
+import pendulum  # noqa F401
 import pytest
 import sqlparse
 from django.apps import apps