FFmpeg 9.0

FFmpeg 9.0 "Lei" has been released with major improvements including a complete rewrite of the swscale library that decomposes video conversions into elementary operations compilable to both CPU and GPU backends, plus new support for animated WebP decoding and various codec enhancements across its 2200+ commits. The release bumps all seven library versions to trigger an ABI break, enabling significant cleanup and modernization of the codebase that accumulates over decades of development.