Update dependency github-markdown-css to v2.10.0

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
github-markdown-css (source)	minor	2.9.0 -> 2.10.0

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Release Notes

sindresorhus/github-markdown-css

### [`v2.10.0`](https://togithub.com/sindresorhus/github-markdown-css/compare/v2.9.0...v2.10.0) [Compare Source](https://togithub.com/sindresorhus/github-markdown-css/compare/v2.9.0...v2.10.0)

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