Security update for xen

This update for xen fixes the following issues: CVE-2026-79608: x86/AMD: ineffectual Zenbleed workaround bsc1283317. CVE-2026-79609: x86: XPTI may break on huge-memory systems bsc1283321. CVE-2026-79610: grant-table: double version change race bsc1283322. CVE-2026-79611: VMX: VMentry failure with...