move pyexpat.ExpatError to xml.parsers.expat.ExpatError (#11168)

This matches the name reported by the cass at runtime.

related to https://github.com/python/typeshed/issues/11141

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

stdlib/pyexpat/__init__.pyi

@@ -3,17 +3,13 @@ from collections.abc import Callable
 from pyexpat import errors as errors, model as model
 from typing import Any, Final, final
 from typing_extensions import TypeAlias
+from xml.parsers.expat import ExpatError as ExpatError
 
 EXPAT_VERSION: Final[str]  # undocumented
 version_info: tuple[int, int, int]  # undocumented
 native_encoding: str  # undocumented
 features: list[tuple[str, int]]  # undocumented
 
-class ExpatError(Exception):
-    code: int
-    lineno: int
-    offset: int
-
 error = ExpatError
 XML_PARAM_ENTITY_PARSING_NEVER: Final = 0
 XML_PARAM_ENTITY_PARSING_UNLESS_STANDALONE: Final = 1

stdlib/xml/parsers/expat/__init__.pyi

@@ -1 +1,7 @@
 from pyexpat import *
+
+# This is actually implemented in the C module pyexpat, but considers itself to live here.
+class ExpatError(Exception):
+    code: int
+    lineno: int
+    offset: int