update to go1.22.8

go1.22.8 (released 2024-10-01) includes fixes to cgo, and the maps and syscall
packages. See the Go 1.22.8 milestone on our issue tracker for details;

- https://github.com/golang/go/issues?q=milestone%3AGo1.22.8+label%3ACherryPickApproved
- full diff: https://github.com/golang/go/compare/go1.22.7...go1.22.8

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

hack/dockerfiles/govulncheck.Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-ARG GO_VERSION=1.22.7
+ARG GO_VERSION=1.22.8
 ARG GOVULNCHECK_VERSION=v1.1.3
 ARG FORMAT=text