Fix `__contains__` on tuple pk searches

[pydanny]

As lists cannot be added to tuples and vice-versa, we cast pk_values to a list.

Python 3.10.6 (main, Dec 12 2023, 14:13:45) [Clang 14.0.3 (clang-1403.0.22.14.1)] on darwin
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>>> [] + ()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: can only concatenate list (not "tuple") to list
>>> () + []
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: can only concatenate tuple (not "list") to tuple

[jph00]

Thank you!