Update request: xen 4.15.1 → 4.18.1

[Orisphera]

• Package name: xen
• Latest released version: 4.18.1

• Current version on the unstable channel: 4.15.1
• Current version on the stable/release channel: 4.15.1

• Checked the nixpkgs pull requests

Notify maintainers

@radhus

Note for maintainers: Please tag this issue in your PR.

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[radhus]

@Orisphera sorry, not using Xen anymore. Too much of an hassle to keep up-to-date 😢

[SigmaSquadron]

You're in luck! #324693