Fix Node package.json ./ exports deprecation warning (#22783)

Author: rinarakaki

packages/react/package.json

@@ -32,7 +32,7 @@
     "./build-info.json": "./build-info.json",
     "./jsx-runtime": "./jsx-runtime.js",
     "./jsx-dev-runtime": "./jsx-dev-runtime.js",
-    "./": "./"
+    "./*": "./*"
   },
   "repository": {
     "type": "git",