Fixes CI

Author: sobolevn

classes/_typeclass.py

@@ -524,7 +524,7 @@ def decorator(implementation):
                 # This means that this type has `__instancecheck__` defined,
                 # which allows dynamic checks of what `isinstance` of this type.
                 # That's why we also treat this type as a protocol.
-                self._protocols[type_argument] = implementation
+                self._protocols[type_argument] = implementation  # type: ignore
 
             if self._cache_token is None:  # pragma: no cover
                 if getattr(type_argument, '__abstractmethods__', None):