ci: Deno v2 doesn't support .cts extension

[wellwelwel]

Related:

• .cjs extension is supported, but not .cts in version 2 (rc) denoland/deno#25498.

Waiting for the resolution of the issue cited to decide if these tests should indeed be removed or if it's a temporary bug.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.07%. Comparing base (523ba74) to head (ec6a7fc).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #744   +/-   ##
=======================================
  Coverage   99.07%   99.07%           
=======================================
  Files          37       37           
  Lines        1725     1725           
  Branches       10       10           
=======================================
  Hits         1709     1709           
  Misses          8        8           
  Partials        8        8           

Flag	Coverage Δ
linux	98.95% <ø> (ø)
osx	99.01% <ø> (ø)
windows	98.95% <ø> (ø)

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