lint: correct subclass path

Surfaced via mypy, corrected.

Unclear why this wouldn't have been caught by other tools.

Signed-off-by: Mike Fiedler <miketheman@gmail.com>

Author: miketheman

warehouse/legacy/api/xmlrpc/views.py

@@ -195,7 +195,7 @@ def faultString(self):  # NOQA: ignore=N802
         return f"client error; {self.exc}"
 
 
-class XMLRPCWrappedError(xmlrpc.server.Fault):
+class XMLRPCWrappedError(xmlrpc.client.Fault):
     def __init__(self, exc):
         # NOQA due to N815 'mixedCase variable in class scope',
         # This is the interface for specifying fault code and string for XmlRpcError