Update ffmpeg-ci to 8.1 from 8.0.1

Author: bump

.github/workflows/unit-test.yml

@@ -27,7 +27,7 @@ jobs:
         uses: ./.github/actions/setup-ffmpeg
         with:
           # bump: ffmpeg-ci /ffmpeg-version: ([\d.]+)/ docker:mwader/static-ffmpeg|/\d+\./|*
-          ffmpeg-version: 8.0.1
+          ffmpeg-version: 8.1
 
       - name: Setup Java
         uses: actions/setup-java@v5