ci: use Node 24 for npm publish (Node 22.22.2 has broken npm)

Node 22.22.2's bundled npm 10.9.7 is missing promise-retry, breaking
npm install -g. Node 24 ships npm 11.11.0 with native OIDC support.

Ref: nodejs/node#62425, actions/runner-images#13883

.github/workflows/publish.yml

@@ -83,10 +83,8 @@ jobs:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
       - uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f  # v6.3.0
         with:
-          node-version: 22
+          node-version: 24  # npm 11.11.0 native — no upgrade needed (Node 22.22.2 has broken npm)
           registry-url: 'https://registry.npmjs.org'
-      - name: Upgrade npm for OIDC support
-        run: npm install -g npm@11
       - name: Build
         run: cd js && npm ci && npm run build
       - name: Publish to npm