fix(deps): update gatsby monorepo

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gatsby (changelog)	2.30.0 -> 2.30.2
gatsby-plugin-sharp	2.12.0 -> 2.12.1
gatsby-transformer-sharp	2.10.0 -> 2.10.1

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Release Notes

gatsbyjs/gatsby

### [`v2.30.2`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.30.1...gatsby@2.30.2) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.30.1...gatsby@2.30.2) ### [`v2.30.1`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.30.0...gatsby@2.30.1) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.30.0...gatsby@2.30.1)

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