fix(deps): update gatsby monorepo

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gatsby (changelog)	dependencies	patch	2.24.77 -> 2.24.78
gatsby-plugin-netlify	dependencies	patch	2.3.18 -> 2.3.19
gatsby-plugin-typescript	dependencies	patch	2.4.21 -> 2.4.22
gatsby-remark-images	dependencies	patch	3.3.33 -> 3.3.34
gatsby-source-contentful	dependencies	patch	2.3.52 -> 2.3.53
gatsby-transformer-remark	dependencies	patch	2.8.39 -> 2.8.40

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Release Notes

gatsbyjs/gatsby

### [`v2.24.78`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.24.77...gatsby@2.24.78) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.24.77...gatsby@2.24.78)

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