chore: update README and system test for node20

[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (c057bf1) 69.50% compared to head (02d54fc) 69.65%. Report is 3 commits behind head on main.

Files	Patch %	Lines
src/logger.ts	84.61%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #919 +/- ## ========================================== + Coverage 69.50% 69.65% +0.14% ========================================== Files 7 7 Lines 1256 1262 +6 Branches 48 49 +1 ========================================== + Hits 873 879 +6 Misses 382 382 Partials 1 1 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.