libwebp-1.3.0

- 12/16/2022: version 1.3.0
  This is a binary compatible release.
  * add libsharpyuv, which exposes -sharp_yuv/config.use_sharp_yuv
    functionality to other libraries; libwebp now depends on this library
  * major updates to the container and lossless bitstream docs (#448, #546,
    #551)
  * miscellaneous warning, bug & build fixes (#576, #583, #584)
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