Xmllint: also lint xsd files

[echoix]

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See super-linter/super-linter#5248

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[nvuillam]

Agreed :)
I think you just have to add .xsd in the xml descriptor + sample xsd files in test cases :)

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Thank you for your contributions.

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[github-actions]

This issue has been automatically marked as stale because it has not had recent activity.
It will be closed in 14 days if no further activity occurs.
Thank you for your contributions.

If you think this issue should stay open, please remove the O: stale 🤖 label or comment on the issue.