Pin dependencies

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
babel-plugin-styled-components	dependencies	pin	^1.10.7 -> 1.10.7
gatsby (changelog)	dependencies	pin	^2.20.35 -> 2.20.35
gatsby-plugin-manifest	dependencies	pin	^2.4.0 -> 2.4.0
gatsby-plugin-offline	dependencies	pin	^3.2.0 -> 3.2.0
gatsby-plugin-react-helmet	dependencies	pin	^3.3.0 -> 3.3.0
gatsby-plugin-styled-components	dependencies	pin	^3.3.0 -> 3.3.0
react (source)	dependencies	pin	^16.12.0 -> 16.13.1
react-dom (source)	dependencies	pin	^16.12.0 -> 16.13.1
react-helmet	dependencies	pin	^6.0.0 -> 6.0.0
styled-components (source)	dependencies	pin	^5.1.0 -> 5.1.0

:pushpin: 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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