Use files() to open *-table JSONs (importlib deprecated open_text)

[cardoso-neto]

I'm using python 3.11 and I'm getting these a lot:

> multiformats_config/multicodec.py:80:
>> with importlib_resources.open_text("multiformats_config", "multicodec-table.json", encoding="utf8") as _table_f:
> multiformats_config/multibase.py:53
>> with importlib_resources.open_text("multiformats_config", "multibase-table.json", encoding="utf8") as _table_f:
DeprecationWarning:
    open_text is deprecated. Use files() instead.
    Refer to https://importlib-resources.readthedocs.io/en/latest/using.html#migrating-from-legacy for migration advice.

And since I'm here, let me state that this is the best implementation of the multiformats protocol I've seen and it is only thanks to this package that I was able to get multiformats adopted where I work.

[cardoso-neto]

Fix could look like this for multibase.py:

    pkg_dir = importlib_resources.files("multiformats_config")
    # then either joinpath
    with pkg_dir.joinpath("multibase-table.json").open(encoding="utf8") as _table_f:
    # or slash operator
    with (pkg_dir / "multibase-table.json").open(encoding="utf8") as _table_f:

[sg495]

Thanks for spotting this! (and for the compliment 😊). We've only recently moved to 3.11 ourselves, and this library hasn't yet been migrated. We'll get to it shortly 👍.