Build(deps): Bump treosh/lighthouse-ci-action from 9.3.1 to 9.6.8 (#718)

Bumps [treosh/lighthouse-ci-action](https://github.com/treosh/lighthouse-ci-action) from 9.3.1 to 9.6.8.
- [Release notes](https://github.com/treosh/lighthouse-ci-action/releases)
- [Commits](treosh/lighthouse-ci-action@9.3.1...9.6.8)

---
updated-dependencies:
- dependency-name: treosh/lighthouse-ci-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/tests.yml

@@ -106,7 +106,7 @@ jobs:
         assert len(unexpected) == 0
 
     - name: Audit with Lighthouse
-      uses: treosh/lighthouse-ci-action@9.3.1
+      uses: treosh/lighthouse-ci-action@9.6.8
       with:
         configPath: ".github/workflows/lighthouserc.json"
         temporaryPublicStorage: true