Use Go 1.23.0 instead of a higher patch release

go 1.23.8 is not yet supported in our build environment, and moreover a
Go version should (generally) be kept to major.minor.0 in a go.mod file.

Signed-off-by: Nolan Brubaker <[email protected]>

Author: nrb

hack/tools/go.mod

@@ -1,6 +1,6 @@
 module sigs.k8s.io/cluster-api-provider-aws/hack/tools
 
-go 1.23.8
+go 1.23.0
 
 require (
 	github.com/a8m/envsubst v1.4.2