Switch from deprecated "toml" library

[CyberTailor]

Fixes #451

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[rsheeter]

Ty for the PR. Apologies for the inconvenience but would you be willing to sign the CLA? - we can't accept otherwise.

[CyberTailor]

I've signed it

[CyberTailor]

https://github.com/googlefonts/nanoemoji/pull/452/checks?check_run_id=13637748132

[anthrotype]

thanks. Can you please run black auto-formatter so that the lint CI job passes as well?

https://github.com/googlefonts/nanoemoji/actions/runs/5036873831/jobs/9036557954?pr=452

[anthrotype]

@CyberTailor oh, I see the lint job failing has nothing to do with your specific PR, it's just a new black version that changed the way it wants to format things (and we keep deps un-pinned so this can happen /cc @rsheeter). You can ignore this, we can fix up later on after merge.

[anthrotype]

python 3.7 complains importlib.resources has no attribute "files"

https://github.com/googlefonts/nanoemoji/actions/runs/5044764986/jobs/9048275533?pr=452#step:5:71

do you mind not reverting that line change for now use the old deprecated method, we may want to drop 3.7 support at some point but maybe not immediately in this PR.

[anthrotype]

I see that files method is 3.9+ only, we do want to support 3.8 for a bit longer. I would rather we keep the deprecation warning (or if we really don't want to see that, only use the newer API for 3.9+)

[CyberTailor]

do you mind not reverting that line change for now use the old deprecated method, we may want to drop 3.7 support at some point but maybe not immediately in this PR.

Reverted.

[anthrotype]

thank you for the contribution and for the patience :)