fix: annotate __reduce__ return type to satisfy pyright

Author: Christian-Sidak

src/mcp/shared/exceptions.py

@@ -105,5 +105,5 @@ def from_error(cls, error: ErrorData) -> UrlElicitationRequiredError:
         elicitations = [ElicitRequestURLParams.model_validate(e) for e in raw_elicitations]
         return cls(elicitations, error.message)
 
-    def __reduce__(self) -> tuple:
+    def __reduce__(self) -> tuple[Any, ...]:
         return (self.from_error, (self.error,))