Fix inputs usage in merge-junit-reports action

Author: Donnerbart

merge-junit-reports/action.yml

@@ -42,7 +42,7 @@ runs:
       with:
         name: ${{ inputs.artifact-name }}
         pattern: ${{ inputs.split-artifact-pattern }}
-        delete-merged: ${{ split-artifact-delete-merged }}
+        delete-merged: ${{ inputs.split-artifact-delete-merged }}
 
     - name: Download JUnit reports artifact
       uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4