fix typography vars

[six7]

Why does this PR exist?

Fixes https://github.com/tokens-studio/figma-plugin/issues/2713

Typography styles werent created with the proper variables

What does this pull request do?

Makes sure we load font async before we try to apply the variable as that's required.

Testing this change

Test the file in the issue and try to follow reproduction steps

Before

After

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Latest commit: f77e3ac78c824acbc6efd22e48d9829b879cda34

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