Update actions/setup-node to v3

Also explicitly select the Node.js version to use, as recommended by the
docs.

The old version also seems to install Node.js 12, which is deprecated by
GitHub runners and cause lots of annotations/warnings in our workflows.

.github/workflows/build-and-test.yml

@@ -136,7 +136,9 @@ jobs:
       - uses: browser-actions/setup-chrome@latest
       - uses: browser-actions/setup-firefox@latest
       - run: chrome --version
-      - uses: actions/setup-node@v2
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 16
 
       - name: npm install
         run: |