[BUG] Intermittent overnight fail on test_monster_loader

[TonyBagnall]

Describe the bug

Overnight tests fail occasionally with this, not sure if its fixable our end
https://github.com/aeon-toolkit/aeon/actions/runs/29300609653/job/86983382422

Steps/Code to reproduce the bug

Run aeon/datasets/tests/test_monster_loader.py::test_load_monster_dataset

Expected results

pass test

Actual results

FAILED aeon/datasets/tests/test_monster_loader.py::test_load_monster_dataset - RuntimeError: Task error: File reconstruction error: CAS Client Error: Request error: HTTP status client error (401 Unauthorized), domain: https://cas-server.xethub.hf.co/v2/reconstructions/9998409e14ba52c68046e6e5ca6849e571adaf04992b3da76f2388638abe6182
= 1 failed, 11328 passed, 297 skipped, 10 xfailed, 27 xpassed, 58593 warnings in 1632.45s (0:27:12) =

Suggested fix

No response

Versions

No response

[saisharan0103]

The repro details point to test_load_monster_dataset failing during file reconstruction from cas-server.xethub.hf.co with a 401, while the rest of the overnight run mostly completed. aeon/datasets/tests/test_monster_loader.py is the part I would inspect first, specifically whether this test depends on an unauthenticated Hugging Face/Xet fetch. For a PR, I would start by making that external dependency deterministic, or by skipping/xfailing only this auth-related path when the remote returns 401.