fix: change exports from import to default to allow require()

Author: mshima

package.json

@@ -13,11 +13,11 @@
   "type": "module",
   "exports": {
     "./mocha-cleanup": {
-      "import": "./dist/mocha-cleanup.hooks.js"
+      "default": "./dist/mocha-cleanup.hooks.js"
     },
     ".": {
       "types": "./dist/index.d.ts",
-      "import": "./dist/index.js"
+      "default": "./dist/index.js"
     }
   },
   "main": "./dist/index.js",