build(turbopack): Update `swc_core` to `v29.4.0` (#81092)
### What?
- ChangeLog for `swc_core`: https://github.com/swc-project/swc/compare/swc_core%40v29.2.0...swc_core%40v29.4.0
- ChangeLog for `styled_jsx`: https://github.com/swc-project/plugins/pull/485
### Why?
To apply the styled-jsx patch
