ci: Add missing npm scope to publish workflow

Authentication via OIDC for NPM's trusted publishing needs to explicitly define
scope if it doesn't match the repository owner.
This is the case here because the repository owner is eclipsesource.

Author: lucas-koehler

.github/workflows/publish.yaml

@@ -41,6 +41,7 @@ jobs:
         with:
           node-version: '22'
           registry-url: 'https://registry.npmjs.org'
+          scope: '@jsonforms' # ensure OIDC token is tied to the scope
 
       - uses: pnpm/action-setup@a7487c7e89a18df4991f7f222e4898a00d66ddda # v4.1.0
         name: Install pnpm