fix: upgrade @testing-library/jest-dom from 6.4.7 to 6.4.8 (#341)

Snyk has created this PR to upgrade @testing-library/jest-dom from 6.4.7 to 6.4.8.

See this package in npm:
@testing-library/jest-dom

See this project in Snyk:
https://app.snyk.io/org/jeremyckahn/project/d52c3b0d-59ff-42e3-89e1-b97ee832bf9a?utm_source=github&utm_medium=referral&page=upgrade-pr

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

Author: jeremyckahn