Update dependency react-helmet to v6.1.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
react-helmet	6.0.0 -> 6.1.0
@types/react-helmet	5.0.17 -> 6.1.2

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Release Notes

nfl/react-helmet

### [`v6.1.0`](https://togithub.com/nfl/react-helmet/blob/master/CHANGELOG.md#​610-httpsgithubcomnflreact-helmetcompare600610-2020-06-08) [Compare Source](https://togithub.com/nfl/react-helmet/compare/6.0.0...6.1.0) ##### Features - Re-add Helmet as a default export [(#​547)](https://togithub.com/nfl/react-helmet/pull/547) - Note: You may now choose `import Helmet` or `import {Helmet}` - Updates react-fast-compare to get support for Preact [(#​559)](https://togithub.com/nfl/react-helmet/pull/559)

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