chore: Update 'package.json' for npm provenance

[smockle]

Fixes #19

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (d087dfa) to head (af2334e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #32   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          455       455           
=========================================
  Hits           455       455           

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