script: replace deprecated pkg_resources with importlib.metadata

in our python linter:

```
./test/lint/lint-python.py:12: DeprecationWarning: pkg_resources is deprecated as an API.
  See https://setuptools.pypa.io/en/latest/pkg_resources.html
  import pkg_resources
```

The importlib.metadata library was added in Python 3.8, which is currently our
minimum-supported Python version.

For more details about importlib.metadata, see https://docs.python.org/3/library/importlib.metadata.html

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