Correct runner name (#2098)

[ROCm/rccl commit: 5384a8abb2]

projects/rccl/.github/workflows/therock-ci-linux.yml

@@ -143,5 +143,5 @@ jobs:
     with:
       amdgpu_families: ${{ inputs.amdgpu_families }}
       artifact_group: ${{ inputs.artifact_group }}
-      test_runs_on: linux-mi325-1gpu-ossci-rocm
+      test_runs_on: linux-mi325-1gpu-ossci-rocm-frac
       artifact_run_id: ${{ github.run_id }}