libwebp-1.2.3

- 6/30/2022: version 1.2.3
  This is a binary compatible release.
  * security fix for lossless encoder (#565, chromium:1313709)
  * improved progress granularity in WebPReportProgress() when using lossless
  * improved precision in Sharp YUV (-sharp_yuv) conversion
  * many corrections to webp-lossless-bitstream-spec.txt (#551)
  * crash/leak fixes on error/OOM and other bug fixes (#558, #563, #569, #573)
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