build(deps-dev): bump typedoc from 0.20.18 to 0.20.20 (#152)

Bumps [typedoc](https://github.com/TypeStrong/TypeDoc) from 0.20.18 to 0.20.20.
- [Release notes](https://github.com/TypeStrong/TypeDoc/releases)
- [Commits](TypeStrong/typedoc@v0.20.18...v0.20.20)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]