perf(dsr1): update B200 FP4 SGLang image to v0.5.21-cu130

Pin lmsysorg/sglang:v0.5.21-cu130 by digest and replace the removed
--cuda-graph-max-bs and --disable-piecewise-cuda-graph flags with their
v0.5.19 alias targets --cuda-graph-max-bs-decode and
--cuda-graph-backend-prefill=disabled.

将 B200 FP4 SGLang 镜像更新至按摘要固定的 lmsysorg/sglang:v0.5.21-cu130，
并将已移除的 --cuda-graph-max-bs 与 --disable-piecewise-cuda-graph 替换为
v0.5.19 中它们所映射的 --cuda-graph-max-bs-decode 与
--cuda-graph-backend-prefill=disabled。

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: github-actions[bot]

inferencex-e2e/benchmarks/single_node/srt-slurm-recipes/dsr1/sglang/b200-fp4/8k1k.yaml

@@ -3,7 +3,7 @@ base:
   name: dsr1-fp4-b200-sglang-8k1k
   model:
     path: hf:nvidia/DeepSeek-R1-0528-FP4-V2
-    container: lmsysorg/sglang:v0.5.19-cu130
+    container: lmsysorg/sglang:v0.5.21-cu130@sha256:b1259f3ea3275f66237c498ea388919729018bc9f01c3d638391e06e2cf3f469
     precision: fp4
   resources:
     gpu_type: b200
@@ -25,7 +25,7 @@ base:
         trust-remote-code: true
         tensor-parallel-size: 4
         data-parallel-size: 1
-        cuda-graph-max-bs: 256
+        cuda-graph-max-bs-decode: 256
         max-running-requests: 256
         mem-fraction-static: 0.85
         kv-cache-dtype: fp8_e4m3
@@ -35,7 +35,7 @@ base:
         enable-flashinfer-allreduce-fusion: true
         scheduler-recv-interval: 10
         enable-symm-mem: true
-        disable-piecewise-cuda-graph: true
+        cuda-graph-backend-prefill: disabled
         attention-backend: trtllm_mla
         moe-runner-backend: flashinfer_trtllm
         stream-interval: 10

inferencex-e2e/configs/nvidia-master.yaml

@@ -860,7 +860,7 @@ dsr1-fp8-b300-dynamo-trt:
           ep: 8
           dp-attn: true
 dsr1-fp4-b200-sglang:
-  image: lmsysorg/sglang:v0.5.19-cu130
+  image: lmsysorg/sglang:v0.5.21-cu130@sha256:b1259f3ea3275f66237c498ea388919729018bc9f01c3d638391e06e2cf3f469
   model: nvidia/DeepSeek-R1-0528-FP4-V2
   model-prefix: dsr1
   runner: cluster:b200-nscale