chore(deps): update gatsby monorepo to v3.7.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gatsby (changelog)	3.6.2 -> 3.7.1
gatsby-plugin-catch-links	3.6.0 -> 3.7.1

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Release Notes

gatsbyjs/gatsby

### [`v3.7.1`](https://togithub.com/gatsbyjs/gatsby/compare/03d497f15bc968d88bb0c85ce427da797b8fc61d...12a78aface75f7970c36a3d9c24a5d8dc5dd30c5) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@3.7.0...gatsby@3.7.1) ### [`v3.7.0`](https://togithub.com/gatsbyjs/gatsby/compare/3d607f1ae0cdde12fb8de53e6d0784f83875df25...52637b6a88f304a79bd3999615e224113b255349) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@3.6.2...gatsby@3.7.0)

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Configuration

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