fix: recognize .mts and .cts extensions as TS files

[wellwelwel]

Closes #356.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (716cf5c) to head (9b0d807).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #474   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           32        31    -1     
  Lines         3484      3497   +13     
  Branches       540       544    +4     
=========================================
+ Hits          3484      3497   +13     

Flag	Coverage Δ
linux-parallel	99.91% <100.00%> (+0.05%)	⬆️
linux-parallel-options	100.00% <100.00%> (+0.05%)	⬆️
linux-sequential	?
linux-sequential-options	?
osx-parallel	95.36% <100.00%> (+0.01%)	⬆️
osx-parallel-options	95.45% <100.00%> (+0.01%)	⬆️
osx-sequential	95.22% <100.00%> (+0.01%)	⬆️
osx-sequential-options	95.31% <100.00%> (+0.01%)	⬆️
windows-parallel	94.85% <100.00%> (+0.01%)	⬆️
windows-parallel-options	94.93% <100.00%> (+0.01%)	⬆️
windows-sequential	?
windows-sequential-options	?

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