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This upgrades FFmpeg to the latest version n4.4.1 and it upgrades some of the build dependencies as well:
https://github.com/FFmpeg/FFmpeg/releases/tag/n4.4.1
streamlink/FFmpeg-Builds@ 20210826-1...20211030-1
https://github.com/streamlink/FFmpeg-Builds/runs/4054376109?check_suite_focus=true#step:4:12

The previous version was a random commit on the 4.4 branch (latest at that time). The main intention of publishing a new build was cleaning up a merge conflict on the FFmpeg-Builds fork.