Bump darc to fix VMR synchronization edge case (#17693)

eng/pipelines/templates/steps/vmr-pull-updates.yml

@@ -22,6 +22,13 @@ steps:
   displayName: Clone dotnet/installer
   path: installer
 
+# This step is needed so that when we get a detached HEAD / shallow clone,
+# we still pull the commit into the temporary installer clone to use it during the sync.
+- script: |
+    git branch installer-head
+  displayName: Label PR commit
+  workingDirectory: $(Agent.BuildDirectory)/installer
+
 - script: |
     git checkout -B ${{ parameters.vmrBranch }}
     echo "##vso[task.setvariable variable=vmrBranch]${{ parameters.vmrBranch }}"