chore: update gatsby monorepo

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
gatsby	dependencies	patch	2.0.97 -> 2.0.98	source
gatsby-image	dependencies	patch	2.0.27 -> 2.0.28	source
gatsby-plugin-netlify	dependencies	patch	2.0.6 -> 2.0.7	source

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Release Notes

gatsbyjs/gatsby

### [`v2.0.98`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.0.97...gatsby@2.0.98) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.0.97...gatsby@2.0.98)

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