[xen staging-4.18] update Xen version to 4.18.6

[patchbot@xxxxxxx]

commit c9355898f3b8e10ca49e87d50e335d682827c33b
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Jul 29 15:36:02 2026 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Jul 29 15:36:02 2026 +0200

    update Xen version to 4.18.6
---
 xen/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/Makefile b/xen/Makefile
index 5fc7fe27da..965373f199 100644
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -6,7 +6,7 @@ this-makefile := $(call lastword,$(MAKEFILE_LIST))
 # All other places this is stored (eg. compile.h) should be autogenerated.
 export XEN_VERSION       = 4
 export XEN_SUBVERSION    = 18
-export XEN_EXTRAVERSION ?= .5$(XEN_VENDORVERSION)
+export XEN_EXTRAVERSION ?= .6$(XEN_VENDORVERSION)
 export XEN_FULLVERSION   = $(XEN_VERSION).$(XEN_SUBVERSION)$(XEN_EXTRAVERSION)
 -include xen-version
 
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generated by git-patchbot for /home/xen/git/xen.git#staging-4.18