feat: improve js engine support (and run tests) in pre-ES2024 envs

[slevithan]

Bumps oniguruma-to-es to patch v0.6.1 to improve JS engine support when using target: 'ES2018'. This includes cases when target: 'auto' is used in pre-ES2024 environments like Node.js 18. I've also updated the JS engine tests to run in such environments.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.09%. Comparing base (fc87512) to head (8c59802).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #847   +/-   ##
=======================================
  Coverage   95.09%   95.09%           
=======================================
  Files          83       83           
  Lines        6927     6927           
  Branches     1458     1458           
=======================================
  Hits         6587     6587           
  Misses        331      331           
  Partials        9        9           

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