Revert "Fix Node package.json ./ exports deprecation warning (react#22783)" (react#22792)

This reverts commit 8edeb78.

Author: eps1lon

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",