Merge pull request #4241 from twz123/backport-4239-to-release-1.27

[Backport to release-1.27] Bump Go to v1.21.9

Author: twz123

embedded-bins/Makefile.variables

@@ -1,7 +1,7 @@
 alpine_version = 3.17
 alpine_patch_version = $(alpine_version).4
 golang_buildimage=docker.io/library/golang:$(go_version)-alpine3.18
-go_version = 1.21.8
+go_version = 1.21.9
 
 runc_version = 1.1.12
 runc_buildimage = $(golang_buildimage)