Update npmpublish.yml

Updated node-version to 18 to match new package.json

.github/workflows/npmpublish.yml

@@ -11,7 +11,7 @@ jobs:
       - uses: actions/checkout@v1
       - uses: actions/setup-node@v1
         with:
-          node-version: '16.x'
+          node-version: '18.x'
           registry-url: https://registry.npmjs.org/
       - run: npm install
       - run: npm publish