Ensure low logging level on npm by default

[Ellpeck]

All exisiting extension points, like the repl, the slicer and the tests, automatically set their log level to their desired level already, so this change will only have an effect on the npm package.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.12%. Comparing base (d4ad9bd) to head (e369b3a).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #717      +/-   ##
==========================================
- Coverage   71.13%   71.12%   -0.02%     
==========================================
  Files         217      217              
  Lines        7033     7033              
  Branches     1095     1095              
==========================================
- Hits         5003     5002       -1     
  Misses       1738     1738              
- Partials      292      293       +1     

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[EagleoutIce]

This pull request is included in v1.4.2 (see Release v1.4.2 (Dropping xmlparsedata, Benchmark Re-Runs, and Repl Fixes)).