chore: Update @vue/test-utils

[HaNdTriX]

This Change fixes broken stubs when using the latest Vue version.

See the following links for more context:

• https://github.com/vuejs/test-utils/pull/2413
• https://github.com/vuejs/test-utils/issues/2411

Info for yarn@1 users

If you can't wait for this PR to be merged & shipped you can use yarn resolutions to force the correct @vue/test-utils version.

package.json

+  "resolutions": {
+    "@testing-library/vue/@vue/test-utils": "^v2.4.6"
+  }