build(deps-dev): Bump prettier and stylelint

[werdnanoslen]

Summary

Updates prettier and stylelint deps. Dependabot for some reason isn't updating stylelint, so that might need a follow-up investigation or perhaps this triggers its attention 🤷 . Anyway, stylelint being outdated was causing some errors in dependabot's upgrade of prettier in #2748. So this upgrades both and also tells it to ignore USWDS functions in our _overrides file. For some reason, stylelint accepted as valid, but did not seem to use, the proper way (vs the disable-next-line way in this PR) of ignoring them in the rc file:

    "function-no-unknown": [
      true, 
      {
        "ignoreFunctions": ["line-height", "units"]
      }
    ]

Related Issues or PRs

Supersedes and fixes lint error in #2748

How To Test

yarn lint should return no warnings or errors

Screenshots (optional)

[werdnanoslen]

I tried using a more targeted rule (see summary above) in the rc file, but lint just ignored it. If anyone finds a way of making that work, remove these comment lines

[github-actions]

	Warnings
⚠️	This PR does not include changes to tests, even though it affects source code.
⚠️	This PR does not include changes to storybook, even though it affects component code.

Generated by 🚫 dangerJS against 676c623

[werdnanoslen]

Superceded by #2716