Fix OSS workflow

Summary:
X-link: facebookresearch/FBGEMM#1453

- Fix HSTU workflow
- 3 hours is not enough for Nova GenAI build, extend to 3.5 hrs.

Reviewed By: gchalump

Differential Revision: D77036108

fbshipit-source-id: c60dcbf1e27d14000f4cf7efd72ee3c80f1f621f

Author: spcyppt

.github/workflows/build_wheels_genai_linux_x86.yml

@@ -75,4 +75,4 @@ jobs:
       test-infra-ref: main
       build-matrix: ${{ needs.filter-matrix.outputs.matrix }}
       trigger-event: ${{ github.event_name }}
-      timeout: 180
+      timeout: 210

.github/workflows/fbgemm_gpu_ci_cuda.yml

@@ -173,8 +173,6 @@ jobs:
           { build-target: "genai", cuda-version: "12.6.3" },
           { build-target: "genai", cuda-version: "12.8.1" },
           { build-target: "genai", cuda-version: "12.9.1" },
-          { build-target: "hstu", cuda-version: "12.6.3" },
-          { build-target: "hstu", cuda-version: "12.8.1" },
           { build-target: "hstu", cuda-version: "12.9.1" },
         ]
         python-version: [ "3.9", "3.10", "3.11", "3.12", "3.13" ]