Remove Istio sidecar injection label from cronjob (#37)

* Remove Istio sidecar injection label from cronjob

Istio has been uninstalled from the cluster. Removing the sidecar
injection label from the cronjob spec.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Apply suggestion from @cmyui

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: cmyui

k8s/cronjob.yaml

@@ -36,6 +36,3 @@ spec:
           restartPolicy: OnFailure
           imagePullSecrets:
             - name: osuakatsuki-registry-secret
-        metadata:
-          labels:
-            sidecar.istio.io/inject: "false"