Update dependency react-helmet to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
react-helmet	^5.2.0 -> ^6.0.0

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Release Notes

nfl/react-helmet

v6.1.0

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Features

• Re-add Helmet as a default export (#​547)
  • Note: You may now choose import Helmet or import {Helmet}
• Updates react-fast-compare to get support for Preact (#​559)

v6.0.0

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Features

• Bundle with Rollup instead of Webpack - As a result, the default export was removed and Helmet must now be imported as a named component - import {Helmet} from "react-helmet" (#​395)
• Replace deepEqual with isEqual (#​402)

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