Merge pull request #4239 from k0sproject/backport-4236-to-release-1.28

[Backport release-1.28] Bump Go to v1.21.9

Author: ncopa

embedded-bins/Makefile.variables

@@ -1,7 +1,7 @@
 alpine_version = 3.18
 alpine_patch_version = $(alpine_version).3
 golang_buildimage=docker.io/library/golang:$(go_version)-alpine$(alpine_version)
-go_version = 1.21.8
+go_version = 1.21.9
 
 runc_version = 1.1.12
 runc_buildimage = $(golang_buildimage)