Bump @testing-library/react in /src/Elastic.Documentation.Site (#3288)

Bumps [@testing-library/react](https://github.com/testing-library/react-testing-library) from 16.3.0 to 16.3.2.
- [Release notes](https://github.com/testing-library/react-testing-library/releases)
- [Changelog](https://github.com/testing-library/react-testing-library/blob/main/CHANGELOG.md)
- [Commits](testing-library/react-testing-library@v16.3.0...v16.3.2)

---
updated-dependencies:
- dependency-name: "@testing-library/react"
  dependency-version: 16.3.2
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

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

@@ -66,7 +66,7 @@
     "@parcel/transformer-svg-react": "2.16.1",
     "@tailwindcss/postcss": "4.2.2",
     "@testing-library/jest-dom": "6.9.1",
-    "@testing-library/react": "16.3.0",
+    "@testing-library/react": "16.3.2",
     "@testing-library/user-event": "14.6.1",
     "@trivago/prettier-plugin-sort-imports": "6.0.2",
     "@types/jest": "30.0.0",