Update dependency typedoc to v0.20.4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
typedoc (source)	0.20.3 -> 0.20.4

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Release Notes

TypeStrong/TypeDoc

### [`v0.20.4`](https://togithub.com/TypeStrong/TypeDoc/releases/v0.20.4) [Compare Source](https://togithub.com/TypeStrong/TypeDoc/compare/v0.20.3...v0.20.4) ##### Bug Fixes - \--excludeNotDocumented didn't remove reflections ([5ebbd0f](https://togithub.com/TypeStrong/TypeDoc/commit/5ebbd0f530bba9748d135381ce0c6d8cc30700e8)), closes [#​1435](https://togithub.com/TypeStrong/TypeDoc/issues/1435)

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[codecov[bot]]

Codecov Report

Merging #340 (77ad7f9) into master (a8ef39e) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #340   +/-   ##
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  Coverage   90.00%   90.00%           
=======================================
  Files           1        1           
  Lines          10       10           
=======================================
  Hits            9        9           
  Misses          1        1           

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