Bump react-helmet from 5.2.1 to 6.1.0

Bumps [react-helmet](https://github.com/nfl/react-helmet) from 5.2.1 to 6.1.0.
- [Release notes](https://github.com/nfl/react-helmet/releases)
- [Changelog](https://github.com/nfl/react-helmet/blob/master/CHANGELOG.md)
- [Commits](https://github.com/nfl/react-helmet/commits/6.1.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -19,7 +19,7 @@
         "mixitup": "^3.3.1",
         "react": "^16.12.0",
         "react-dom": "^16.12.0",
-        "react-helmet": "^5.2.1",
+        "react-helmet": "^6.1.0",
         "react-loader-spinner": "^3.1.5",
         "react-markdown": "^5.0.3",
         "react-multi-carousel": "^2.5.0",