Update dependency typedoc-plugin-markdown to v3.15.4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
typedoc-plugin-markdown (source)	3.15.3 -> 3.15.4

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Release Notes

tgreyuk/typedoc-plugin-markdown (typedoc-plugin-markdown)

### [`v3.15.4`](https://togithub.com/tgreyuk/typedoc-plugin-markdown/blob/HEAD/packages/typedoc-plugin-markdown/CHANGELOG.md#3154-2022-07-24) [Compare Source](https://togithub.com/tgreyuk/typedoc-plugin-markdown/compare/7ece46d49ac7932c9b7c49be6a9cead824015ec4...typedoc-plugin-markdown@3.15.4) ##### Fixes - Split out comment summary and tags for signatures [(#​451)](https://togithub.com/tgreyuk/typedoc-plugin-markdown/issues/451)

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Configuration

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

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