fix: update test to match new AirbyteTracedException message

The test_cloud_read_with_private_endpoint test asserted the old generic
Exception message. Updated to match the new AirbyteTracedException
message from _make_handled_request.

Co-Authored-By: bot_apk <apk@cognition.ai>

Author: devin-ai-integration[bot]

unit_tests/connector_builder/test_connector_builder_handler.py

@@ -1288,7 +1288,7 @@ def test_handle_read_external_requests(deployment_mode, url_base, expected_error
         pytest.param(
             "CLOUD",
             "https://10.0.27.27/tokens/bearer",
-            "Error while refreshing access token",
+            "OAuth access token refresh request failed.",
             id="test_cloud_read_with_private_endpoint",
         ),
         pytest.param(