Update TTL mechanism in Job to stable

This commit update feature stage for TTL mechanism in Job with stable.
TTL mechanism has been GA from k8s v1.23, so we can update "beta" to "stable".

Author: atoato88

content/en/docs/concepts/workloads/controllers/job.md

@@ -308,7 +308,7 @@ cleaned up by CronJobs based on the specified capacity-based cleanup policy.
 
 ### TTL mechanism for finished Jobs
 
-{{< feature-state for_k8s_version="v1.21" state="beta" >}}
+{{< feature-state for_k8s_version="v1.23" state="stable" >}}
 
 Another way to clean up finished Jobs (either `Complete` or `Failed`)
 automatically is to use a TTL mechanism provided by a