Bump treosh/lighthouse-ci-action from 9.3.1 to 9.6.8 (#3355)

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>

Author: dependabot[bot]

.github/workflows/production-checks.yml

@@ -28,7 +28,7 @@ jobs:
     - name: Set the list of URLs for Lighthouse to check
       run: ./src/tools/scripts/set_lighthouse_urls.sh -p
     - name: Audit URLs using Lighthouse
-      uses: treosh/lighthouse-ci-action@9.3.1
+      uses: treosh/lighthouse-ci-action@9.6.8
       id: LHCIAction
       with:
         # For prod, we simply check for 100% in Accessibility, Best Practices and SEO

.github/workflows/test_website.yml

@@ -53,7 +53,7 @@ jobs:
         COMMIT_SHA: ${{ github.sha }}
       run: ./src/tools/scripts/set_lighthouse_urls.sh
     - name: Audit URLs using Lighthouse
-      uses: treosh/lighthouse-ci-action@9.3.1
+      uses: treosh/lighthouse-ci-action@9.6.8
       id: LHCIAction
       with:
         # For dev, turn off all timing perf audits (too unreliable) and a few others that don't work on dev