Test GenericAlias

Author: nateprewitt

codegen/core/src/main/java/software/amazon/smithy/python/codegen/ClientGenerator.java

@@ -599,7 +599,7 @@ await sleep(retry_token.retry_delay)
                                 context.properties["signature"] = signature.encode('utf-8')
 
                                 identity_key = PropertyKey(key="identity", value_type=Identity | None)
-                                sp_key = PropertyKey(key="signer_properties", value_type=dict)
+                                sp_key = PropertyKey(key="signer_properties", value_type=dict[str, Any])
                                 context.properties[identity_key] = identity
                                 context.properties[sp_key] = auth_option.signer_properties
                     """);