bridge tests occasionally fail in CI

[Kailai-Wang]

Context

See:
https://github.com/litentry/litentry-parachain/actions/runs/3266952986/attempts/1
https://github.com/litentry/litentry-parachain/actions/runs/3266952986/attempts/2

Normally it can be resolved by restarting the whole CI job -- but we need a closer look into it when we have time.

---

✔️ Please set appropriate labels and assignees if applicable.

[Kailai-Wang]

https://github.com/litentry/litentry-parachain/actions/runs/3289216092