Bump Go to v1.21.10

https://groups.google.com/g/golang-announce/c/wkkO4P9stm0/m/IcuqZRViCgAJ
https://go.dev/doc/devel/release#go1.21.10
https://github.com/golang/go/issues?q=milestone%3AGo1.21.10+label%3ACherryPickApproved

Fixes CVE-2024-24787 and CVE-2024-24788.

Signed-off-by: Tom Wieczorek <twieczorek@mirantis.com>
(cherry picked from commit 60ac562)

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 = 1.21.9
+go_version = 1.21.10
 
 runc_version = 1.1.12
 runc_buildimage = $(golang_buildimage)