Update dependency FFmpeg/FFmpeg to v8.1.1 (#38888)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Dockerfile

@@ -234,7 +234,7 @@ FROM media-build AS ffmpeg
 
 # ffmpeg version to compile, change with [--build-arg FFMPEG_VERSION="7.0.x"]
 # renovate: datasource=github-tags depName=FFmpeg/FFmpeg extractVersion=^n(?<version>\d+\.\d+(\.\d+)?)$
-ARG FFMPEG_VERSION=8.1
+ARG FFMPEG_VERSION=8.1.1
 # ffmpeg download URL, change with [--build-arg FFMPEG_URL="https://ffmpeg.org/releases"]
 ARG FFMPEG_URL=https://github.com/FFmpeg/FFmpeg/archive/refs/tags