fix: suppress npm always-auth deprecation warning by upgrading to setup-node@v6 (#847)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: jbrejner

.github/workflows/release.yml

@@ -145,7 +145,7 @@ jobs:
           check-latest: true
 
       - name: Set up Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: '24'
           registry-url: 'https://registry.npmjs.org'