feat: Update supported Kubernetes versions in outdated-k8s-version rule

This commit updates the supported Kubernetes versions in the `outdated-k8s-version` rule. The versions `v1.31`, `v1.30`, and `v1.29` are now considered supported.

Signed-off-by: kooomix <[email protected]>

rules/outdated-k8s-version/raw.rego

@@ -18,7 +18,7 @@ deny[msga] {
 
 has_outdated_version(version)  {
 	# the `supported_k8s_versions` is validated in the validations script against "https://api.github.com/repos/kubernetes/kubernetes/releases"
-    supported_k8s_versions := ["v1.30", "v1.29", "v1.28"] 
+    supported_k8s_versions := ["v1.31", "v1.30", "v1.29"] 
 	every v in supported_k8s_versions{
 		not startswith(version, v)
 	}