Use .node-version for gh workflow

Author: rossta

.github/workflows/deploy.yml

@@ -33,7 +33,7 @@ jobs:
       - name: Set up Node
         uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version-file: .node-version
           cache: 'npm'
       - name: Install dependencies
         run: npm ci