[xen staging-4.21] update Xen version to 4.21.3-pre

[patchbot@xxxxxxx]

commit 911331555d65abc2d42c4cf86965fc9447f04f4a
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Mon Aug 24 11:49:53 2026 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Aug 24 11:49:53 2026 +0200

    update Xen version to 4.21.3-pre
---
 xen/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/Makefile b/xen/Makefile
index 1d7c07d1fb..bdf9a4f3a1 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    = 21
-export XEN_EXTRAVERSION ?= .2$(XEN_VENDORVERSION)
+export XEN_EXTRAVERSION ?= .3-pre$(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-4.21