Update dependency gatsby to v2.21.23

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gatsby (changelog)	dependencies	patch	2.21.16 -> 2.21.23

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Release Notes

gatsbyjs/gatsby

### [`v2.21.23`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.21.22...gatsby@2.21.23) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.21.22...gatsby@2.21.23) ### [`v2.21.22`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.21.21...gatsby@2.21.22) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.21.21...gatsby@2.21.22) ### [`v2.21.21`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.21.20...gatsby@2.21.21) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.21.20...gatsby@2.21.21) ### [`v2.21.20`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.21.19...gatsby@2.21.20) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.21.19...gatsby@2.21.20) ### [`v2.21.19`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.21.18...gatsby@2.21.19) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.21.18...gatsby@2.21.19) ### [`v2.21.18`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.21.17...gatsby@2.21.18) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.21.17...gatsby@2.21.18) ### [`v2.21.17`](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.21.16...gatsby@2.21.17) [Compare Source](https://togithub.com/gatsbyjs/gatsby/compare/gatsby@2.21.16...gatsby@2.21.17)

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