Bump @babel/preset-env in /src/Elastic.Documentation.Site (#2253)

Bumps [@babel/preset-env](https://github.com/babel/babel/tree/HEAD/packages/babel-preset-env) from 7.28.3 to 7.28.5.
- [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/v7.28.5/packages/babel-preset-env)

---
updated-dependencies:
- dependency-name: "@babel/preset-env"
  dependency-version: 7.28.5
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

src/Elastic.Documentation.Site/package-lock.json

@@ -45,7 +45,7 @@
   "private": true,
   "devDependencies": {
     "@babel/core": "7.28.4",
-    "@babel/preset-env": "7.28.3",
+    "@babel/preset-env": "7.28.5",
     "@babel/preset-react": "7.27.1",
     "@babel/preset-typescript": "7.27.1",
     "@elastic/synthetics": "1.19.0",