[Versioning] Use python 3.8 for GPU tests (#1577)

Author: Vincent Moens

.github/workflows/test-linux-gpu.yml

@@ -22,8 +22,8 @@ jobs:
   tests:
     strategy:
       matrix:
-        python_version: ["3.9"] # "3.8", "3.9", "3.10", "3.11"
-        cuda_arch_version: ["12.1"] # "11.6", "11.7"
+        python_version: ["3.8"]
+        cuda_arch_version: ["12.1"]
       fail-fast: false
     uses: pytorch/test-infra/.github/workflows/linux_job.yml@main
     with:

.github/workflows/test-linux-stable-gpu.yml

@@ -22,7 +22,7 @@ jobs:
   tests:
     strategy:
       matrix:
-        python_version: ["3.9"] # "3.8", "3.9", "3.10", "3.11"
+        python_version: ["3.8"] # "3.8", "3.9", "3.10", "3.11"
         cuda_arch_version: ["11.8"] # "11.6", "11.7"
       fail-fast: false
     uses: pytorch/test-infra/.github/workflows/linux_job.yml@main