Install accelerate from PyPI in PR test runner (#5721)

install acclerate from pypi

.github/workflows/pr_tests.yml

@@ -72,7 +72,7 @@ jobs:
       run: |
         apt-get update && apt-get install libsndfile1-dev libgl1 -y
         python -m pip install -e .[quality,test]
-        python -m pip install git+https://github.com/huggingface/accelerate.git
+        python -m pip install accelerate
 
     - name: Environment
       run: |