fix: fix module resolution for esm file (#1484)

Author: sheremet-va

package.json

@@ -5,7 +5,16 @@
   "main": "dist/vue-test-utils.cjs.js",
   "unpkg": "dist/vue-test-utils.browser.js",
   "types": "dist/index.d.ts",
-  "module": "dist/vue-test-utils.esm-bundler.js",
+  "module": "dist/vue-test-utils.esm-bundler.mjs",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/vue-test-utils.esm-bundler.mjs",
+      "browser": "./dist/vue-test-utils.browser.js",
+      "require": "./dist/vue-test-utils.cjs.js",
+      "default": "./dist/vue-test-utils.cjs.js"
+    }
+  },
   "files": [
     "dist",
     "README.md",