Core Changes

• revert changes to process default routes at build: #61241
• Fix cookie merging in Server Action redirections: #61113
• Update swc_core to v0.89.x: #61086

Misc Changes

• Fix edge-light-import-specifier test for Turbopack: #61234

Credits

Huge thanks to @ztanner, @timneutkens, @shuding, and @kdy1 for helping!