Actually run integration tests with the corresponding runtime

[acelaya]

#242 introduced support for Deno and Bun, and updated the integration tests pipeline to run against them.

However, the commands being run are making it execute on node.js in all cases, even if those runtimes are installed.

This PR ensures the tests are in fact run with the proper runtime.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.55%. Comparing base (0d61540) to head (ebec6aa).
Report is 14 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #244   +/-   ##
=======================================
  Coverage   70.55%   70.55%           
=======================================
  Files           8        8           
  Lines         309      309           
  Branches       95       95           
=======================================
  Hits          218      218           
  Misses          3        3           
  Partials       88       88           

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