Use Node 24 for native npm 11.x support

Node 22's npm 10.x can't self-upgrade to 11.x cleanly.
Node 24 ships with npm 11.x, matching the trusted publishing requirement.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: asklar

.github/workflows/publish.yml

@@ -17,11 +17,9 @@ jobs:
 
       - uses: actions/setup-node@v6
         with:
-          node-version: '22'
+          node-version: '24'
           registry-url: 'https://registry.npmjs.org'
 
-      - run: npm install -g npm@latest
-
       - run: npm ci
 
       - run: npm run build