Example Changes

• updated the example of custom-routes-proxying to utilize the App Router: #68941

Misc Changes

• chore(github): update reactionSchema: #69203
• sync-react: Automatically update all references to the React peer dependency version: #69194
• Stop testing react-dom/server in RSCs: #69139

Credits

Huge thanks to @samcx, @eps1lon, and @Sam-Phillemon9493 for helping!