Update python-app.yml

Author: learnforpractice

.github/workflows/python-app.yml

@@ -53,8 +53,9 @@ jobs:
       - name: Install dependencies on the linux platform
         if: ${{ matrix.os == 'ubuntu-20.04' }}
         run: |
-          python -m pip install -U patchelf
+          sudo apt update
           sudo apt-get install libusb-1.0-0-dev libudev-dev
+          python -m pip install -U patchelf
       # - name: Lint with flake8
       #   run: |
       #     # stop the build if there are Python syntax errors or undefined names