Update dependency registry1.dso.mil/ironbank/opensource/kubernetes/kubectl to v1.26.3

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/opensource/kubernetes/kubectl	patch	v1.26.2 -> v1.26.3

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chart/Chart.yaml

 apiVersion: v2
 name: kyverno-policies
-version: 1.1.0-bb.4
+version: 1.1.0-bb.5
 appVersion: 1.1.0
 icon: https://github.com/kyverno/kyverno/raw/main/img/logo.png
 description: Collection of Kyverno security and best-practice policies for Kyverno
@@ -22,4 +22,4 @@ annotations:
   # Kubectl image is used if waitforready.enabled or bbtests.enabled
   helm.sh/images: |
     - name: kubectl
-      image: registry1.dso.mil/ironbank/opensource/kubernetes/kubectl:v1.26.2
+      image: registry1.dso.mil/ironbank/opensource/kubernetes/kubectl:v1.26.3