Add skip-nuget-publish label to Dependabot updates (#1310)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: aaronpowell <434140+aaronpowell@users.noreply.github.com>

Author: Copilot

.github/dependabot.yml

@@ -9,6 +9,9 @@ updates:
     directory: "/" # Location of package manifests
     schedule:
       interval: "weekly"
+    labels:
+      - "dependencies"
+      - "skip-nuget-publish"
     ignore:
       # Ignore Aspire.Hosting and Aspire.Hosting.*   . We have a separate process for updating them
       - dependency-name: "Aspire.Hosting"
@@ -17,3 +20,6 @@ updates:
     directory: "/" # Location of package manifests
     schedule:
       interval: "weekly"
+    labels:
+      - "dependencies"
+      - "skip-nuget-publish"