Update dependency typedoc to v0.20.21

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
typedoc (source)	0.20.20 -> 0.20.21

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Release Notes

TypeStrong/TypeDoc

### [`v0.20.21`](https://togithub.com/TypeStrong/TypeDoc/releases/v0.20.21) [Compare Source](https://togithub.com/TypeStrong/TypeDoc/compare/v0.20.20...v0.20.21) ##### Bug Fixes - Missing exported members in file-as-namespace reflection ([1423960](https://togithub.com/TypeStrong/TypeDoc/commit/1423960dd64ec16197df925527ed4f3216b4184c)), closes [#​1493](https://togithub.com/TypeStrong/TypeDoc/issues/1493)

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[codecov[bot]]

Codecov Report

Merging #363 (bc7b68c) into master (2f634db) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #363   +/-   ##
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  Coverage   90.00%   90.00%           
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  Files           1        1           
  Lines          10       10           
  Branches        1        1           
=======================================
  Hits            9        9           
  Misses          1        1           

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