fix: cronjob.batch/v1 is invalid in k8s v1.19 (#6178)

fix: auto update extension museum only when kubernetes version > =v1.20.0

Signed-off-by: joyceliu <joyceliu@yunify.com>
Co-authored-by: joyceliu <joyceliu@yunify.com>

config/ks-core/templates/extension-museum.yaml

@@ -51,7 +51,7 @@ spec:
   url: http://extensions-museum.{{ .Release.Namespace }}.svc
 
 ---
-apiVersion: batch/v1
+apiVersion: {{ if semverCompare ">=1.20.0" .Capabilities.KubeVersion.Version }}batch/v1{{ else }}batch/v1beta1{{end}}
 kind: CronJob
 metadata:
   name: restart-extensions-museum