Use yarn to install dependencies

reviewdoc-action-prettier is automatically running npm, but that fails. We use yarn so maybe if we call it first, npm won't get called? Worth a try.

.github/workflows/linters.yml

@@ -24,6 +24,14 @@ jobs:
     steps:
       - name: Check out code
         uses: actions/checkout@v3
+
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 16
+
+      - name: Install JS dependencies
+        run: yarn install --frozen-lockfile
+
       - name: prettier
         uses: EPMatt/reviewdog-action-prettier@v1
         with: