Remove bare Incomplete annotations in third-party stubs (#11671)

stubs/jsonschema/jsonschema/exceptions.pyi

@@ -32,8 +32,8 @@ class _Error(Exception):
         cause: Incomplete | None = None,
         context: Sequence[ValidationError] = (),
         validator_value=...,
-        instance: Incomplete = ...,
-        schema: Incomplete = ...,
+        instance=...,
+        schema=...,
         schema_path: Sequence[str | int] = (),
         parent: _Error | None = None,
         type_checker: _utils.Unset | TypeChecker = ...,