Fix hardcoded pod infra version

Signed-off-by: bo.jiang <bo.jiang@daocloud.io>

roles/download/defaults/main.yml

@@ -117,7 +117,6 @@ flannel_version: "v0.21.4"
 flannel_cni_version: "v1.2.0"
 cni_version: "v1.3.0"
 weave_version: 2.8.1
-pod_infra_version: "3.9"
 
 cilium_version: "v1.13.0"
 cilium_cli_version: "v0.13.1"
@@ -135,6 +134,12 @@ skopeo_version: v1.10.0
 # Get kubernetes major version (i.e. 1.17.4 => 1.17)
 kube_major_version: "{{ kube_version | regex_replace('^v([0-9])+\\.([0-9]+)\\.[0-9]+', 'v\\1.\\2') }}"
 
+pod_infra_supported_version:
+  v1.26: "3.9"
+  v1.25: "3.8"
+  v1.24: "3.7"
+pod_infra_version: "{{ pod_infra_supported_version[kube_major_version] }}"
+
 etcd_supported_versions:
   v1.26: "v3.5.6"
   v1.25: "v3.5.6"