Bump Go to v1.22.8

https://groups.google.com/g/golang-announce/c/NKEc8VT7Fz0
https://go.dev/doc/devel/release#go1.23.2
https://github.com/golang/go/issues?q=milestone%3AGo1.23.2+label%3ACherryPickApproved

Signed-off-by: Tom Wieczorek <twieczorek@mirantis.com>
(cherry picked from commit c7c3046)

embedded-bins/Makefile.variables

@@ -1,7 +1,7 @@
 alpine_version = 3.20
 alpine_patch_version = $(alpine_version).1
 golang_buildimage=docker.io/library/golang:$(go_version)-alpine$(alpine_version)
-go_version = 1.22.7
+go_version = 1.22.8
 
 runc_version = 1.1.14
 runc_buildimage = $(golang_buildimage)