fix(deps): update gatsby monorepo

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gatsby (changelog)	2.30.2 -> 2.30.3
gatsby-plugin-sharp	2.12.1 -> 2.12.2
gatsby-source-contentful	4.4.0 -> 4.4.1
gatsby-source-filesystem	2.9.0 -> 2.9.1

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Release Notes

gatsbyjs/gatsby

### [`v2.30.3`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.30.2...gatsby@2.30.3) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.30.2...gatsby@2.30.3)

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