fix(deps): update gatsby

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gatsby	dependencies	patch	^2.16.1 -> ^2.16.5
gatsby-plugin-netlify	dependencies	patch	^2.1.21 -> ^2.1.22
gatsby-plugin-sharp	dependencies	patch	^2.2.31 -> ^2.2.32

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Release Notes

gatsbyjs/gatsby

### [`v2.16.5`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.16.4...gatsby@2.16.5) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.16.4...gatsby@2.16.5) ### [`v2.16.4`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.16.3...gatsby@2.16.4) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.16.3...gatsby@2.16.4) ### [`v2.16.3`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.16.2...gatsby@2.16.3) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.16.2...gatsby@2.16.3) ### [`v2.16.2`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.16.1...gatsby@2.16.2) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.16.1...gatsby@2.16.2)

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