fix: remove job-level permissions that override workflow permissions

The release-production job had `permissions: id-token: write` which
OVERRIDES and REPLACES the workflow-level permissions, removing
`contents: write` needed for creating GitHub releases.

Removed the job-level permissions block so the job inherits all
workflow-level permissions (including contents: write).

This aligns with cfxdb and wamp-xbr which don't have job-level
permissions on release-production.

Note: This work was completed with AI assistance (Claude Code).

Author: oberstet

.github/workflows/release.yml

@@ -193,8 +193,6 @@ jobs:
     environment:
       name: pypi
       url: https://pypi.org/p/crossbar
-    permissions:
-      id-token: write  # For trusted publishing
 
     steps:
       - name: Checkout code