fix(deps): update dependency gatsby to v2.20.7

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gatsby	dependencies	patch	2.20.6 -> 2.20.7

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Release Notes

gatsbyjs/gatsby

### [`v2.20.7`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.20.6...gatsby@2.20.7) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.20.6...gatsby@2.20.7)

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