fix: always load cjs bundle in node environment

Author: danielroe

package.json

@@ -9,6 +9,7 @@
   "exports": {
     ".": {
       "types": "./dist/index.d.ts",
+      "node": "./dist/vue-test-utils.cjs.js",
       "import": "./dist/vue-test-utils.esm-bundler.mjs",
       "browser": "./dist/vue-test-utils.browser.js",
       "require": "./dist/vue-test-utils.cjs.js",