CompatHelper: bump compat for JLD2 to 0.6, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the JLD2 package from 0.5.11 to 0.5.11, 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 48.77%. Comparing base (1efad54) to head (63a7fd2).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #54   +/-   ##
=======================================
  Coverage   48.77%   48.77%           
=======================================
  Files          22       22           
  Lines        2663     2663           
=======================================
  Hits         1299     1299           
  Misses       1364     1364           

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