[Workflows] remove installation of redundant modules from flax PR tests (#7662)

remove installation of redundant modules from flax PR tests

Author: sayakpaul

.github/workflows/pr_tests.yml

@@ -146,7 +146,6 @@ jobs:
     - name: Run fast Flax TPU tests
       if: ${{ matrix.config.framework == 'flax' }}
       run: |
-        apt-get update && apt-get install libsndfile1-dev libgl1 -y
         python -m venv /opt/venv && export PATH="/opt/venv/bin:$PATH"
         python -m pytest -n 4 --max-worker-restart=0 --dist=loadfile \
           -s -v -k "Flax" \