CompatHelper: bump compat for CUDA in [weakdeps] to 6, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the CUDA package from 5.8.2 to 5.8.2, 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 99.20%. Comparing base (09fc114) to head (697e4f6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #313   +/-   ##
=======================================
  Coverage   99.20%   99.20%           
=======================================
  Files          20       20           
  Lines        2145     2145           
=======================================
  Hits         2128     2128           
  Misses         17       17           

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