fix(deps): update gatsby

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gatsby	dependencies	patch	^2.17.4 -> ^2.17.7
gatsby-image	dependencies	patch	^2.2.29 -> ^2.2.30
gatsby-plugin-manifest	dependencies	patch	^2.2.23 -> ^2.2.26
gatsby-plugin-netlify	dependencies	patch	^2.1.22 -> ^2.1.23
gatsby-plugin-offline	dependencies	patch	^3.0.16 -> ^3.0.17
gatsby-plugin-sharp	dependencies	patch	^2.2.32 -> ^2.2.36
gatsby-plugin-typography	dependencies	patch	^2.3.14 -> ^2.3.15
gatsby-transformer-sharp	dependencies	patch	^2.3.0 -> ^2.3.2

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Release Notes

gatsbyjs/gatsby

### [`v2.17.7`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.17.6...gatsby@2.17.7) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.17.6...gatsby@2.17.7) ### [`v2.17.6`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.17.5...gatsby@2.17.6) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.17.5...gatsby@2.17.6) ### [`v2.17.5`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.17.4...gatsby@2.17.5) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.17.4...gatsby@2.17.5)

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