Bump @types/markdown-it from 10.0.1 to 10.0.3

Bumps [@types/markdown-it](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/markdown-it) from 10.0.1 to 10.0.3.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/markdown-it

)

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