Update Gatsby

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gatsby (source, changelog)	4.24.7 -> 4.24.8
gatsby-plugin-robots-txt	1.7.1 -> 1.8.0

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Release Notes

gatsbyjs/gatsby

### [`v4.24.8`](https://togithub.com/gatsbyjs/gatsby/compare/c7b94b59251e45188290c18147313562a7e537ba...ab793c3f0eee95eee3017585d63beb4b83492cd1) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/c7b94b59251e45188290c18147313562a7e537ba...ab793c3f0eee95eee3017585d63beb4b83492cd1)

mdreizin/gatsby-plugin-robots-txt

### [`v1.8.0`](https://togithub.com/mdreizin/gatsby-plugin-robots-txt/releases/tag/v1.8.0) [Compare Source](https://togithub.com/mdreizin/gatsby-plugin-robots-txt/compare/v1.7.1...v1.8.0) ##### Features - support for Gatsby v5 ([#​679](https://togithub.com/mdreizin/gatsby-plugin-robots-txt/issues/679)) ([f53feb3](https://togithub.com/mdreizin/gatsby-plugin-robots-txt/commit/f53feb361ce1e60cf3b6acc8e64f3ca06a84cf74))

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