ModelHubMixin: Fix attributes lost in inheritance (#2305)
* ModelHubMixn: Fix attributes lost in inhericance
* make style
* deprecate
* style
* Update src/huggingface_hub/hub_mixin.py
Co-authored-by: Pavel Iakubovskii <qubvel@gmail.com>
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Co-authored-by: Pavel Iakubovskii <qubvel@gmail.com>