build(deps-dev): bump @firebase/auth-compat from 0.6.6 to 0.6.8 (#3187)

Bumps [@firebase/auth-compat](https://github.com/firebase/firebase-js-sdk/tree/HEAD/packages/auth-compat) from 0.6.6 to 0.6.8.
- [Release notes](https://github.com/firebase/firebase-js-sdk/releases)
- [Changelog](https://github.com/firebase/firebase-js-sdk/blob/main/packages/auth-compat/CHANGELOG.md)
- [Commits](https://github.com/firebase/firebase-js-sdk/commits/@firebase/auth-compat@0.6.8/packages/auth-compat)

---
updated-dependencies:
- dependency-name: "@firebase/auth-compat"
  dependency-version: 0.6.8
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Co-authored-by: Lahiru Maramba <llahiru@gmail.com>

Author: dependabot[bot]