[CI] Speed up GPU PR Tests (huggingface#11887)

update

Co-authored-by: Sayak Paul <[email protected]>

Author: DN6

.github/workflows/pr_tests_gpu.yml

@@ -188,7 +188,7 @@ jobs:
         shell: bash
     strategy:
       fail-fast: false
-      max-parallel: 2
+      max-parallel: 4
       matrix:
         module: [models, schedulers, lora, others]
     steps: