Update auto-update.yml

.github/workflows/auto-update.yml

@@ -41,6 +41,8 @@ jobs:
       - uses: actions/checkout@v3
       - name: Install ffmpeg
         run: |
+          sudo rm -rf /var/lib/apt/lists/*
+          sudo apt-get clean
           sudo apt-get update -y
           sudo apt-get install -y ffmpeg
           ffmpeg -version