chore(deps): update rust crate markdown to v1.0.0-alpha.18

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
markdown	dev-dependencies	patch	1.0.0-alpha.17 -> 1.0.0-alpha.18

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Release Notes

wooorm/markdown-rs (markdown)

### [`v1.0.0-alpha.18`](https://togithub.com/wooorm/markdown-rs/releases/tag/1.0.0-alpha.18) [Compare Source](https://togithub.com/wooorm/markdown-rs/compare/1.0.0-alpha.17...1.0.0-alpha.18) - [`f0c7ad1`](https://togithub.com/wooorm/markdown-rs/commit/f0c7ad1) Refactor code-style **Full Changelog**: https://github.com/wooorm/markdown-rs/compare/1.0.0-alpha.17...1.0.0-alpha.18

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Configuration

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🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• [ ] If you want to rebase/retry this PR, check this box

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