chore(deps-dev): bump @vue/test-utils from 2.2.7 to 2.2.8

Bumps [@vue/test-utils](https://github.com/vuejs/test-utils) from 2.2.7 to 2.2.8.
- [Release notes](https://github.com/vuejs/test-utils/releases)
- [Commits](vuejs/test-utils@v2.2.7...v2.2.8)

---
updated-dependencies:
- dependency-name: "@vue/test-utils"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -71,7 +71,7 @@
     "@vue/cli-plugin-typescript": "~5.0.8",
     "@vue/cli-plugin-unit-mocha": "^5.0.8",
     "@vue/cli-service": "~5.0.8",
-    "@vue/test-utils": "^2.2.7",
+    "@vue/test-utils": "^2.2.8",
     "@vuepress/plugin-register-components": "2.0.0-beta.60",
     "@vuepress/plugin-search": "2.0.0-beta.60",
     "@vuepress/plugin-shiki": "2.0.0-beta.60",