chore(deps): replace dependency @tsconfig/node18 with @tsconfig/node20

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
@tsconfig/node18 (source) → @tsconfig/node20		replacement	18 → 20
@tsconfig/node18 (source) → @tsconfig/node20	devDependencies	replacement	18.2.6 → 20.1.0

This is a special PR that replaces @tsconfig/node18 with the community suggested minimal stable replacement version.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.72%. Comparing base (3632abf) to head (9548888).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #220   +/-   ##
=======================================
  Coverage   72.72%   72.72%           
=======================================
  Files           1        1           
  Lines          22       22           
  Branches        5        5           
=======================================
  Hits           16       16           
  Misses          3        3           
  Partials        3        3           

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