bump(mdformat): update to v0.7.19

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mdformat (changelog)	0.7.18 -> 0.7.19

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Release Notes

executablebooks/mdformat (mdformat)

### [`v0.7.19`](https://redirect.github.com/executablebooks/mdformat/compare/0.7.18...0.7.19) [Compare Source](https://redirect.github.com/executablebooks/mdformat/compare/0.7.18...0.7.19)

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