Fix ModelHubMixin: pass config when __init__ accepts **kwargs

[Wauplin]

Fix a breaking change introduced in #2001.

Since #2001, we fetch the config.json file in ModelHubMixin and parse the config as a dict or dataclass depending on the expected param in __init__. If config is not expected, we don't pass it to _from_pretrained (otherwise it'll brake when instantiating the class). This PR fixes this behavior by sending the config value also when __init__ accepts **kwargs, which is the default when nothing is defined.

cc @mfuntowicz who noticed the breaking change

Once this PR is approved and merged, I'll make a hot-fix release (0.21.3).

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.72%. Comparing base (e7f243c) to head (87ad4ee).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2058      +/-   ##
==========================================
+ Coverage   80.70%   80.72%   +0.02%     
==========================================
  Files          71       71              
  Lines        8519     8521       +2     
==========================================
+ Hits         6875     6879       +4     
+ Misses       1644     1642       -2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[LysandreJik]

Makes sense! Thanks for fixing it!

[Wauplin]

Thanks for the quick review @LysandreJik! I'm merging now and will proceed with 0.21.3 release.