fix: remove broken npm upgrade step from release workflow

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: yamitzky

.github/workflows/release.yml

@@ -39,5 +39,4 @@ jobs:
         with:
           node-version: "22"
           registry-url: "https://registry.npmjs.org"
-      - run: npm install -g npm@latest
       - run: npm publish --provenance --access public