Update dependency typedoc to v0.20.9

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
typedoc (source)	0.20.8 -> 0.20.9

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Release Notes

TypeStrong/TypeDoc

### [`v0.20.9`](https://togithub.com/TypeStrong/TypeDoc/releases/v0.20.9) [Compare Source](https://togithub.com/TypeStrong/TypeDoc/compare/v0.20.8...v0.20.9) ##### Bug Fixes - Parameter declarations might not exist ([1886304](https://togithub.com/TypeStrong/TypeDoc/commit/1886304f327da5642097834feac0387fd1b78b6e)), closes [#​1443](https://togithub.com/TypeStrong/TypeDoc/issues/1443)

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[codecov[bot]]

Codecov Report

Merging #345 (2e0d1b0) into master (01a42bd) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #345   +/-   ##
=======================================
  Coverage   90.00%   90.00%           
=======================================
  Files           1        1           
  Lines          10       10           
  Branches        0        1    +1     
=======================================
  Hits            9        9           
  Misses          1        1           

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