Update node.js.yml

Fix node version to 18

.github/workflows/node.js.yml

@@ -14,17 +14,12 @@ jobs:
 
     runs-on: ubuntu-latest
 
-    strategy:
-      matrix:
-        node-version: [14.x, 16.x, 18.x]
-        # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
-
     steps:
     - uses: actions/checkout@v4
-    - name: Use Node.js ${{ matrix.node-version }}
+    - name: Use Node.js 18
       uses: actions/setup-node@v4
       with:
-        node-version: ${{ matrix.node-version }}
+        node-version: '18'
         cache: 'npm'
     - run: npm ci
     - run: npm run build --if-present