fix: revert exports field to support all node versions (#2658)

Author: ahnpnl

package.json

@@ -3,14 +3,6 @@
   "version": "27.0.2",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
-  "exports": {
-    ".": "./dist/index.js",
-    "./dist/*": "./dist/*.js",
-    "./jest-preset": "./jest-preset.js",
-    "./presets": "./presets/index.js",
-    "./utils": "./utils/index.js",
-    "./package.json": "./package.json"
-  },
   "bin": {
     "ts-jest": "cli.js"
   },