Updating the github workflow with npm, as the yarn v1 doesn't support moderate level for security vulnerabilities

Author: RohitKandimalla

.github/workflows/ci.yml

@@ -19,13 +19,13 @@ jobs:
       uses: actions/setup-node@v1
       with:
         node-version: ${{ matrix.node-version }}
-    - name: Install Yarn
-      run: npm install -g yarn
-    - name: Run yarn
+    - name: Run npm
       run: |
-        yarn install
-        yarn run lint
-        yarn run test
-        yarn audit --level moderate
+        npm ci
+        npm run lint
+        npm test
+    - name: Audit dependencies (moderate+)
+      run: |
+        npm audit --audit-level=moderate
     - name: Run validation
       run: ./bin/validate_browser.sh