CompatHelper: bump compat for JLD2 in [weakdeps] to 0.6, (keep existing compat)

compat helperrequested to merge
compathelper/new_version/2025-08-26-14-35-11-172-00385164284 into dev

This pull request changes the compat entry for the JLD2 package from 0.4.53, 0.5 to 0.4.53, 0.5, 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.

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