fix the github linux build and test

Signed-off-by: Ronnie Sahlberg <[email protected]>

.github/workflows/py.yml

@@ -19,6 +19,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
         run:   |
+          sudo apt update --fix-missing
           sudo apt install python-is-python3
           sudo apt install python3-pip
           sudo apt install libsndfile-dev