Update node.js.yml

Use only Node 18

Author: StanleyMasinde

.github/workflows/node.js.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [16.x, 18.x]
+        node-version: [18.x]
     steps:
     - uses: actions/checkout@v3
     - name: Use Node.js ${{ matrix.node-version }}