Update dependency @types/node to v20

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@types/node (source)	18.18.1 -> 20.9.0

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[codecov]

Codecov Report

Merging #87 (dade240) into master (46d3fb4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #87   +/-   ##
=======================================
  Coverage   91.75%   91.75%           
=======================================
  Files          12       12           
  Lines         376      376           
  Branches       85       85           
=======================================
  Hits          345      345           
  Misses         10       10           
  Partials       21       21           

Flag	Coverage Δ
unittests	91.75% <ø> (ø)

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