Suppress v7 warnings in production build (#12509)

Author: rakleed

contributors.yml

@@ -215,6 +215,7 @@
 - petersendidit
 - promet99
 - pyitphyoaung
+- rakleed
 - refusado
 - rimian
 - robbtraister

packages/react-router/lib/deprecations.ts

@@ -4,7 +4,7 @@ import type { FutureConfig as RenderFutureConfig } from "./components";
 const alreadyWarned: { [key: string]: boolean } = {};
 
 export function warnOnce(key: string, message: string): void {
-  if (!alreadyWarned[message]) {
+  if (__DEV__ && !alreadyWarned[message]) {
     alreadyWarned[message] = true;
     console.warn(message);
   }