Bump treosh/lighthouse-ci-action from 11 to 12

Bumps [treosh/lighthouse-ci-action](https://github.com/treosh/lighthouse-ci-action) from 11 to 12.
- [Release notes](https://github.com/treosh/lighthouse-ci-action/releases)
- [Commits](treosh/lighthouse-ci-action@v11...v12)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/lighthouse.yml

@@ -30,7 +30,7 @@ jobs:
       - name: Serve site
         run: bundle exec jekyll serve &
       - name: Lighthouse CI Action
-        uses: treosh/lighthouse-ci-action@v11
+        uses: treosh/lighthouse-ci-action@v12
         with:
           urls: |
             $SITE_URL/