Minor update for fs2:v0.5+ compatibility

[cirquit]

Why ?

Stopes is used with libraries that use fairseq2:v0.5+ and needs to be upgraded to play nice with them.
It would be optimal to create a new minor release by bumping the version here, build a new release candidate and upload the wheel to PyPi.

How ?

Upgraded the code that is loaded by default when initializing the library and bumped the fairseq2 version to >=v0.5. (42b28bb)

A few additional changes were required to make the CI happy again:

• black==22.1 on the CI for some reason (v24 was a big change in default behavior) and I needed to align it (245936f)
• isort was not happy as well, needed to update (245936f)
• there was an async loop initialization issue when accessing it from a thread that does not have an event loop, replaced it with a generic solution that does not assume a loop is running to remove the RuntimeError: There is no current event loop in thread 'MainThread'. I suspect that this happened because of pytest-asyncio>=0.15.0 which changed in the past 9 months (50a9d85)
• I replaced the mnist-text dataset that was used in the test_hf_shards.py file because it used dataset scripts which are no longer supported RuntimeError: Dataset scripts are no longer supported. Replaced with rotten_tomatoes because it uses parquet by default. (4d5b835)

Test plan

Got the CI running again.