fix(cronjobs): deprecated batch api

k8s/cronjobs/mysql-dump-cronjob-daily.yml

-apiVersion: batch/v1beta1
+apiVersion: batch/v1
 kind: CronJob
 metadata:
   name: mysql-dump-cronjob-daily

k8s/cronjobs/mysql-dump-cronjob-hourly.yml

-apiVersion: batch/v1beta1
+apiVersion: batch/v1
 kind: CronJob
 metadata:
   name: mysql-dump-cronjob-hourly

k8s/cronjobs/mysql-dump-cronjob-weekly.yml

-apiVersion: batch/v1beta1
+apiVersion: batch/v1
 kind: CronJob
 metadata:
   name: mysql-dump-cronjob-weekly