[ci] update ut image to triggle pt2.9+tf5.2 ci test

Author: CyCle1024

.github/workflows/unit_test.yaml

@@ -15,7 +15,7 @@ on:
 env:
   WORKSPACE_PREFIX: $(echo $GITHUB_WORKSPACE |cut -d '/' -f 1-5)
   WORKSPACE_PREFIX_SHORT: $(echo $GITHUB_WORKSPACE |cut -d '/' -f 1-3)
-  IMAGE: registry.h.pjlab.org.cn/ailab-llmrazor/xtuner_tmp:pt28_20260303_a9c0c04
+  IMAGE: registry.h.pjlab.org.cn/ailab-llmrazor/xtuner_tmp:pt29_20260318_95a8ccf
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}