update to fix a11y tests

Author: nicolethoen

.github/workflows/pr-preview.yml

@@ -52,10 +52,10 @@ jobs:
       - run: node .github/upload-preview.js packages/module/public
         name: Upload docs
         if: always()
-      - run: yarn serve:docs & yarn test:a11y
-        name: a11y tests
       - name: Install Chrome for Puppeteer
         run: npx puppeteer browsers install chrome
+      - run: yarn serve:docs & yarn test:a11y
+        name: a11y tests
       - run: node .github/upload-preview.js packages/module/coverage
         name: Upload a11y report
         if: always()