Update registry1.dso.mil/ironbank/opensource/kubernetes/kubectl Docker tag to v1.30.8

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/opensource/kubernetes/kubectl (source)	patch	v1.30.7 -> v1.30.8

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• Followed upgrade instructions outlined in docs/DEVELOPMENT_MAINTENANCE.md
• Update Docs with new/updated steps as needed
• Tested and Validated Changes made with supporting info like logs or screenshots from test pipelines

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chart/Chart.yaml

@@ -3,7 +3,7 @@ appVersion: 1.15.0
 kubeVersion: ">=1.16.0-0"
 description: A Helm chart for velero
 name: velero
-version: 7.2.2-bb.4
+version: 8.1.0-bb.0
 home: https://github.com/vmware-tanzu/velero
 icon: https://cdn-images-1.medium.com/max/1600/1*-9mb3AKnKdcL_QD3CMnthQ.png
 sources:
@@ -41,7 +41,7 @@ annotations:
     - name: velero
       image: registry1.dso.mil/ironbank/opensource/velero/velero:v1.15.0
     - name: kubectl
-      image: registry1.dso.mil/ironbank/opensource/kubernetes/kubectl:v1.30.7
+      image: registry1.dso.mil/ironbank/opensource/kubernetes/kubectl:v1.30.8
     - name: velero-tester
       condition: bbtests.enabled
       image: registry1.dso.mil/bigbang-ci/velero-tester:1.1.0