Bump @babel/preset-env from 7.13.15 to 7.15.6

Bumps [@babel/preset-env](https://github.com/babel/babel/tree/HEAD/packages/babel-preset-env) from 7.13.15 to 7.15.6.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.15.6/packages/babel-preset-env)

---
updated-dependencies:
- dependency-name: "@babel/preset-env"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

package.json

@@ -18,7 +18,7 @@
   },
   "devDependencies": {
     "@babel/core": "^7.14.3",
-    "@babel/preset-env": "^7.13.15",
+    "@babel/preset-env": "^7.15.6",
     "@vue/babel-preset-app": "^4.5.12",
     "@vue/test-utils": "^1.1.4",
     "babel-loader": "^8.2.2",