fix(deps): update dependency gatsby to v2.22.20

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gatsby (changelog)	dependencies	patch	2.22.16 -> 2.22.20

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Release Notes

gatsbyjs/gatsby

### [`v2.22.20`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.22.19...gatsby@2.22.20) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.22.19...gatsby@2.22.20) ### [`v2.22.19`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.22.18...gatsby@2.22.19) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.22.18...gatsby@2.22.19) ### [`v2.22.18`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.22.17...gatsby@2.22.18) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.22.17...gatsby@2.22.18) ### [`v2.22.17`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.22.16...gatsby@2.22.17) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.22.16...gatsby@2.22.17)

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