v1.20260123.0

What's Changed

• Support step context from Python Workflows SDK by @Caio-Nogueira in https://github.com/cloudflare/workerd/pull/5634
• Fixup unsafe attachments of user spans by @danlapid in https://github.com/cloudflare/workerd/pull/5944
• fix kj-test & wd-test test coverage reporting by @anonrig in https://github.com/cloudflare/workerd/pull/5881

Full Changelog: https://github.com/cloudflare/workerd/compare/v1.20260122.0...v1.20260123.0