chore: bump @testing-library/react from 12.1.4 to 12.1.5 in /site (#1019)

Bumps [@testing-library/react](https://github.com/testing-library/react-testing-library) from 12.1.4 to 12.1.5.
- [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](https://github.com/testing-library/react-testing-library/compare/v12.1.4...v12.1.5)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

site/package.json

@@ -51,7 +51,7 @@
     "@storybook/addon-essentials": "6.4.21",
     "@storybook/addon-links": "6.4.21",
     "@storybook/react": "6.4.21",
-    "@testing-library/react": "12.1.4",
+    "@testing-library/react": "12.1.5",
     "@testing-library/user-event": "14.1.0",
     "@types/express": "4.17.13",
     "@types/jest": "27.4.1",