Update node version from 16.x to 18.x

Author: curder

.github/workflows/build-docs.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v3
         with:
-          node-version: '16.x'
+          node-version: '18.x'
 
       - name: Get yarn cache
         id: yarn-cache