chore(deps): update dependency github-markdown-css to ^5.6.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github-markdown-css	^5.5.0 -> ^5.6.1

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Release Notes

sindresorhus/github-markdown-css (github-markdown-css)

### [`v5.6.1`](https://togithub.com/sindresorhus/github-markdown-css/releases/tag/v5.6.1) [Compare Source](https://togithub.com/sindresorhus/github-markdown-css/compare/v5.6.0...v5.6.1) - Regenerate GitHub CSS [`eb15d90`](https://togithub.com/sindresorhus/github-markdown-css/commit/eb15d90) ### [`v5.6.0`](https://togithub.com/sindresorhus/github-markdown-css/releases/tag/v5.6.0) [Compare Source](https://togithub.com/sindresorhus/github-markdown-css/compare/v5.5.1...v5.6.0) - Regenerate GitHub CSS [`5e1d34a`](https://togithub.com/sindresorhus/github-markdown-css/commit/5e1d34a) ### [`v5.5.1`](https://togithub.com/sindresorhus/github-markdown-css/releases/tag/v5.5.1) [Compare Source](https://togithub.com/sindresorhus/github-markdown-css/compare/v5.5.0...v5.5.1) - Fix compatibility with Rollup [`9411b37`](https://togithub.com/sindresorhus/github-markdown-css/commit/9411b37)

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Latest commit: 8e52584aeb2249b29210abf0e304d48928b208fc

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size-limit report 📦

Path	Size
lib/index.js	885 B (0%)

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (53f85f8) to head (4fe9ecc).

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```diff @@ Coverage Diff @@ ## main #45 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 1 1 Lines 94 94 Branches 44 44 ========================================= Hits 94 94 ```

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