Fix Windows CI

[andrewwinters5000]

Windows seems to take sometime to close an IOStream and a file. This bumps up the amount of idle time to avoid erroneous errors that occur with back-to-back generate_mesh and remove_mesh! calls on Windows systems.

Windows sometimes does not close the IOStream and release a file. With the advice from here adding an explicit call to the garbage collector GC.gc() before one attempts to delete the file fixes the CI issue.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.81%. Comparing base (ee72a13) to head (621228c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #58   +/-   ##
=======================================
  Coverage   98.81%   98.81%           
=======================================
  Files          21       21           
  Lines        1863     1863           
=======================================
  Hits         1841     1841           
  Misses         22       22           

Flag	Coverage Δ
unittests	98.81% <ø> (ø)

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[coveralls]

coverage: 98.819%. first build
when pulling 8469747 on fix-windows-ci
into ee72a13 on main.

[coveralls]

coverage: 98.819%. first build
when pulling 621228c on fix-windows-ci
into ee72a13 on main.