CompatHelper: bump compat for CUDACore to 6, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the CUDACore package from =6.1.0 to =6.1.0, 6.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 16.41%. Comparing base (8288a3a) to head (6e2acb7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3144      +/-   ##
==========================================
+ Coverage   16.40%   16.41%   +0.01%     
==========================================
  Files         124      124              
  Lines        9827     9827              
==========================================
+ Hits         1612     1613       +1     
+ Misses       8215     8214       -1     

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