Update DSv4 FP4 MI355X SGLang AgentX MTP image to v0.5.21-rocm720-mi35x-20261010

Pin lmsysorg/sglang-rocm:v0.5.21-rocm720-mi35x-20261010 by digest in the
master config and its srt-slurm recipe.

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

Author: github-actions[bot]

inferencex-e2e/benchmarks/single_node/srt-slurm-recipes/dsv4/sglang/mi355x-fp4-mtp/agentic.yaml

@@ -9,7 +9,7 @@ base:
   name: dsv4-fp4-mi355x-sglang-agentic
   model:
     path: hf:deepseek-ai/DeepSeek-V4-Pro-0813
-    container: lmsysorg/sglang-rocm:v0.5.21-rocm720-mi35x-20261007
+    container: lmsysorg/sglang-rocm:v0.5.21-rocm720-mi35x-20261010@sha256:abc9e62d3f2b6f9dd3284619900cef7066a60552d0440e36c608801e0aeb5673
     precision: fp4
   resources:
     gpu_type: mi355x

inferencex-e2e/configs/amd-master.yaml

@@ -1468,7 +1468,7 @@ glm5.2-fp4-mi355x-atom-agentic-mtp:
        - { tp: 8, kv-offloading: none, conc-list: [1, 2, 4], spec-decoding: mtp, srt-recipe: benchmarks/single_node/srt-slurm-recipes/glm5.2/atom/mi355x-fp4-mtp/agentic.yaml }
 
 dsv4-fp4-mi355x-sglang-agentic-mtp:
-  image: lmsysorg/sglang-rocm:v0.5.21-rocm720-mi35x-20261007
+  image: lmsysorg/sglang-rocm:v0.5.21-rocm720-mi35x-20261010@sha256:abc9e62d3f2b6f9dd3284619900cef7066a60552d0440e36c608801e0aeb5673
   model: deepseek-ai/DeepSeek-V4-Pro-0813
   model-prefix: dsv4
   runner: cluster:mi355x-amds