fix(deps): update gatsby monorepo

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gatsby (changelog)	dependencies	patch	2.24.87 -> 2.24.89
gatsby-source-contentful	dependencies	patch	3.0.4 -> 3.0.5
gatsby-source-filesystem	dependencies	patch	2.3.36 -> 2.3.37

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Release Notes

gatsbyjs/gatsby

### [`v2.24.89`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.24.88...gatsby@2.24.89) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.24.88...gatsby@2.24.89) ### [`v2.24.88`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.24.87...gatsby@2.24.88) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.24.87...gatsby@2.24.88)

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