abandon ffmpeg action and just install -dev libraries with apt

.github/workflows/rust.yml

@@ -14,13 +14,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-    - uses: FedericoCarboni/setup-ffmpeg@v3
+    - name: Install prerequisite libraries
-      id: setup-ffmpeg
+      run: sudo apt install -y libavcodec-dev libavformat-dev libavutil-dev
-      with:
-        linking-type: static
-        # As of version 3 of this action, builds are no longer downloaded from GitHub
-        # except on Windows: https://github.com/GyanD/codexffmpeg/releases.
-        github-token: ${{ github.server_url == 'https://github.com' && github.token || '' }}
     - name: Rust Cache
       uses: Swatinem/rust-cache@v2.7.7
       with: