Update gatsby monorepo

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gatsby (changelog)	dependencies	patch	2.21.9 -> 2.21.12
gatsby-plugin-google-analytics	dependencies	patch	2.3.0 -> 2.3.1
gatsby-source-graphql	dependencies	patch	2.5.0 -> 2.5.1

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Release Notes

gatsbyjs/gatsby

### [`v2.21.12`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.21.11...gatsby@2.21.12) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.21.11...gatsby@2.21.12) ### [`v2.21.11`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.21.10...gatsby@2.21.11) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.21.10...gatsby@2.21.11) ### [`v2.21.10`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.21.9...gatsby@2.21.10) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.21.9...gatsby@2.21.10)

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