chore(deps-dev): bump @types/react-helmet from 6.1.0 to 6.1.5 in /docs

Bumps [@types/react-helmet](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/react-helmet) from 6.1.0 to 6.1.5.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/react-helmet)

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

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

docs/package.json

@@ -48,7 +48,7 @@
     "@tsconfig/docusaurus": "^1.0.2",
     "@types/js-yaml": "^4.0.5",
     "@types/react": "^17.0.3",
-    "@types/react-helmet": "^6.1.0",
+    "@types/react-helmet": "^6.1.5",
     "@types/react-router-dom": "^5.1.7",
     "eslint": "^7.32.0",
     "eslint-config-prettier": "^8.5.0",