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 5.9.1 to 5.9.1, 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 88.70%. Comparing base (3a5900a) to head (30e8fcf).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1138   +/-   ##
=======================================
  Coverage   88.70%   88.70%           
=======================================
  Files         128      128           
  Lines        9764     9764           
=======================================
  Hits         8661     8661           
  Misses       1103     1103           

Flag	Coverage Δ
total	88.70% <ø> (ø)
unit	66.95% <ø> (ø)

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[svchb]

/run-gpu-tests

[svchb]

/run-gpu-tests