v4.2.67
Introduce a GitHub Actions workflow for running the font tests
Replace `done` callbacks in the font-tests with async/await instead
Update `ttx` from version 2.5 to version 3.19.0
Add non-PRODUCTION/TESTING overflow `assert`s to various string helper-functions (issue 6759)
Use native `import maps` in development mode
Simplify the `decodeFontData`/`encodeFontData` font-test helper functions
Enable the ESLint `prefer-spread` rule
Convert the TTX driver code to promises