Bump @babel/preset-env from 7.15.4 to 7.15.6

Bumps [@babel/preset-env](https://github.com/babel/babel/tree/HEAD/packages/babel-preset-env) from 7.15.4 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-patch
...

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

package.json

@@ -11,7 +11,7 @@
     "@babel/plugin-proposal-class-properties": "^7.14.5",
     "@babel/plugin-proposal-private-methods": "^7.14.5",
     "@babel/plugin-transform-modules-umd": "^7.14.5",
-    "@babel/preset-env": "^7.15.4",
+    "@babel/preset-env": "^7.15.6",
     "@babel/preset-react": "^7.14.5",
     "@babel/preset-typescript": "^7.15.0",
     "@typescript-eslint/eslint-plugin": "^4.31.0",