build(deps-dev): bump @vue/cli-plugin-babel from 4.5.14 to 4.5.15

Bumps [@vue/cli-plugin-babel](https://github.com/vuejs/vue-cli/tree/HEAD/packages/@vue/cli-plugin-babel) from 4.5.14 to 4.5.15.
- [Release notes](https://github.com/vuejs/vue-cli/releases)
- [Changelog](https://github.com/vuejs/vue-cli/blob/dev/CHANGELOG.md)
- [Commits](https://github.com/vuejs/vue-cli/commits/v4.5.15/packages/@vue/cli-plugin-babel)

---
updated-dependencies:
- dependency-name: "@vue/cli-plugin-babel"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -46,7 +46,7 @@
     "vue": "^2.6.14"
   },
   "devDependencies": {
-    "@vue/cli-plugin-babel": "~4.5.14",
+    "@vue/cli-plugin-babel": "~4.5.15",
     "@vue/cli-plugin-eslint": "~4.5.15",
     "@vue/cli-plugin-unit-mocha": "~4.5.15",
     "@vue/cli-service": "~4.5.15",