Bump actions/upload-artifact from 5 to 6 (#5014)

Bumps
[actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.

- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c

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.github/workflows/_e2e_nightly_single_node_models.yaml

@@ -223,7 +223,7 @@ jobs:
 
       - name: Upload Report
         if: ${{ inputs.upload == true }}
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: report-${{ env.GHA_VLLM_ASCEND_VERSION }}-${{ steps.ts.outputs.artifact_ts }}
           path: ./benchmarks/accuracy/