Apply auto-merge label to Update version PRs (Azure#16683)

Author: pakrym

eng/pipelines/templates/stages/archetype-net-release.yml

@@ -219,6 +219,7 @@ stages:
                           PRBranchName: increment-package-version-${{ parameters.ServiceDirectory }}-$(Build.BuildId)
                           CommitMsg: "Increment package version after release of ${{ artifact.name }}"
                           PRTitle: "Increment version for ${{ parameters.ServiceDirectory }} releases"
+                          PRLabels: "auto-merge"
                           CloseAfterOpenForTesting: '${{ parameters.TestPipeline }}'
 
   - stage: Integration
@@ -253,4 +254,4 @@ stages:
           inputs:
             command: push
             packagesToPush: '$(Pipeline.Workspace)/${{parameters.ArtifactName}}-signed/${{artifact.name}}/*.nupkg;!$(Pipeline.Workspace)/${{parameters.ArtifactName}}-signed/${{artifact.name}}/*.symbols.nupkg'
-            publishVstsFeed: $(DevOpsFeedID)
+            publishVstsFeed: $(DevOpsFeedID)