update image versions to most recent

Author: hgarvison

hello-world/ACI/arm-template.json

@@ -18,7 +18,7 @@
     },
     "image": {
       "type": "string",
-      "defaultValue": "mcr.microsoft.com/public/acc/samples/aci/helloworld:2.1",
+      "defaultValue": "mcr.microsoft.com/acc/samples/aci/helloworld:2.7",
       "metadata": {
         "description": "Container image to deploy. Should be of the form repoName/imagename:tag for images stored in public Docker Hub, or a fully qualified URI for other registries. Images from private registries require additional registry credentials."
       }

hello-world/AKS/helloworld.yaml

@@ -7,7 +7,7 @@ metadata:
   name: helloworld
 spec:
   containers:
-    - image: "mcr.microsoft.com/public/acc/samples/aks/helloworld:1.2"
+    - image: "mcr.microsoft.com/acc/samples/aks/helloworld:1.5"
       command:
         - python3.10
         - main.py