pytype: ignore some signature mismatch in configitems
pytype is grumpy about the dict.update having a more complex signature than the
one we use here.
pytype error:
itemregister: Overriding method signature mismatch [signature-mismatch]
Base signature: 'def builtins.dict.update(self) -> None'.
Subclass signature: 'def itemregister.update(self, other) -> Any'.
Parameter 'other' must have a default value.
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