fix(deps): pin dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
gatsby (changelog)	dependencies	pin	^3.1.0 -> 3.9.1
gatsby-image	dependencies	pin	^3.1.0 -> 3.9.0
gatsby-plugin-manifest	dependencies	pin	^3.1.0 -> 3.9.0
gatsby-plugin-offline	dependencies	pin	^4.1.0 -> 4.9.0
gatsby-plugin-postcss	dependencies	pin	^4.1.0 -> 4.9.0
gatsby-plugin-react-helmet	dependencies	pin	^4.1.0 -> 4.9.0
gatsby-plugin-sharp	dependencies	pin	^3.1.0 -> 3.9.0
gatsby-source-filesystem	dependencies	pin	^3.1.0 -> 3.9.0
gatsby-transformer-sharp	dependencies	pin	^3.1.0 -> 3.9.0

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

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