Update skia to m116

[mattleibow]

Description of Change

The numbers are so close and the API is almost identical. I do see a missing API so we might as well lose it for now since we are breaking and we then have to break less in the next version.

API Changes

Removed:

• SKImageFilter.CreateAlphaThreshold
  The image filter SKImageFilter.CreateAlphaThreshold is no longer implemented in native skia and has been removed.
  According to Google:

  SkImageFilters::AlphaThreshold has been removed. Its only use was in ChromeOS and that usage has been replaced with a Blend(kSrcIn, input, Picture(region)) filter graph to achieve the same effect.

  There does not seem to be an equivalent replacement, but also I have not seen any usages of it.

Behavioral Changes

None.

Required skia PR

mono/skia#122

PR Checklist

• Has tests (if omitted, state reason in description)
• Rebased on top of main at time of PR
• Merged related skia PRs
• Changes adhere to coding standard
• Updated documentation

[mattleibow]

/azp run

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