pyright ignore assign to __class__ of Protocol

Signed-off-by: Eden Ross Duff, MSc, DDiv <[email protected]>

blastpipe/backports.py

@@ -84,7 +84,7 @@ def get_identifiers(self: IsTemplatePre311) -> List[str]:  # pragma: defer to st
     @classmethod
     def extend_with(cls: type[IsTemplatePre311], instance: _T) -> _T:
         """Extend the class with the mixin instance."""
-        instance.__class__ = type(
+        instance.__class__ = type(  # pyright: ignore
             f'{instance.__class__.__name__}With{cls.__name__}',
             (instance.__class__, cls),
             {},