Update dependency gatsby to v2.28.2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gatsby (changelog)	2.28.0 -> 2.28.2

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Release Notes

gatsbyjs/gatsby

### [`v2.28.2`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.28.1...gatsby@2.28.2) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.28.1...gatsby@2.28.2) ### [`v2.28.1`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.28.0...gatsby@2.28.1) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.28.0...gatsby@2.28.1)

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Renovate configuration

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