ci: do not upgrade pip

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

.github/workflows/checksum_checker.yaml

@@ -20,7 +20,6 @@ jobs:
         run: |
           sudo apt-get update
           sudo apt-get install -y pip wget
-          sudo pip install --upgrade pip
           pip install huggingface_hub
       - name: 'Setup yq'
         uses: dcarbone/install-yq-action@v1.3.1