Pin dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
@​types/react-helmet	devDependencies	pin	^5.0.8 -> 5.0.8	source
@​types/typography	devDependencies	pin	^0.16.2 -> 0.16.2	source
typescript	devDependencies	pin	^3.4.1 -> 3.4.1	homepage, source

📌 Important: Renovate will wait until you have merged this Pin PR before creating any upgrade PRs for the affected packages. Add the preset :preserveSemverRanges your config if you instead don't wish to pin dependencies.

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