fix: upgrade npm for OIDC trusted publishing support

OIDC trusted publishing requires npm >= 11.5.1, but Node.js 20/22
ships with npm 10.x. Added explicit npm upgrade step before publish.

Also upgraded to Node.js 22 for better npm compatibility.

Conceived by Romuald Członkowski - www.aiadvisors.pl/en

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -318,10 +318,15 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 22
           cache: 'npm'
           registry-url: 'https://registry.npmjs.org'
-      
+
+      - name: Upgrade npm for OIDC support
+        run: |
+          npm install -g npm@latest
+          echo "npm version: $(npm --version)"
+
       - name: Install dependencies
         run: npm ci