Fix CI hang while running test-readme-mps-macos (#968)

Author: malfet

.github/workflows/run-readme-pr-mps.yml

@@ -11,7 +11,7 @@ jobs:
     with:
       runner: macos-m1-14
       script: |
-          conda create -y -n test-readme-mps-macos python=3.10.11
+          conda create -y -n test-readme-mps-macos python=3.10.11 llvm-openmp
           conda activate test-readme-mps-macos
           set -x
           # NS: Remove previous installation  of torch first