Fix Dependabot

Author: andyleejordan

.github/dependabot.yml

@@ -1,7 +1,15 @@
 version: 2
+registries:
+  nuget-azure:
+    type: nuget-feed
+    url: https://pkgs.dev.azure.com/mscodehub/PowerShellCore/_packaging/PowerShellCore_PublicPackages/nuget/v3/index.json
+    username: powershell-rel
+    password: ${{ secrets.AZURE_NUGET_PASSWORD }}
 updates:
 - package-ecosystem: nuget
   directory: "/"
+  registries:
+    - nuget-azure
   labels: [ ]
   schedule:
     interval: weekly