this should fix the message during CI
```
.../setuptools_scm/git.py:163: UserWarning: "/home/runner/work/circuitpython-build-tools/circuitpython-build-tools" is shallow and may cause errors
  warnings.warn(f'"{wd.path}" is shallow and may cause errors')
```

This may have been introduced when upgrading action/checkout recently,
or it might be pre-existing.

This saves ~50% on the main bundle and will save ~85% on the fonts bundle