Update libwebp to 1.6.0

[mattleibow]

Summary

Update libwebp version in cgmanifest.json from 1.3.2 to 1.6.0.

Companion PR

• Update libwebp to 1.6.0 skia#166 (contains DEPS and BUILD.gn changes)

libwebp 1.6.0 Release Notes

• Security fix: heap overflow in webpmux (-get/-set)
• Speed and compression improvements
• Histogram optimizations
• New AVX2 optimizations (optional, auto-enabled when available)
• Various bug fixes

Testing

• ✅ Local macOS arm64 build succeeded
• ✅ All SkiaSharp tests passed (5340 passed)

Links

• libwebp v1.6.0 tag

[github-actions]

Triage Summary

Labels will be applied to indicate compatibility with macOS as the local arm64 build succeeded, signaling a successful run on that platform.

This issue is not classified as a regression since it pertains to updating a library version without performance or compatibility concerns with the previous version of SkiaSharp.

Additional remarks:

• The issue focuses on an update to the libwebp library and does not relate to any existing labels, including specific areas like SkiaSharp or documentation.
• There are no applicable labels regarding backend technologies or graphics APIs mentioned in the issue.

Detailed Summary and Actions

Summary of the triage:

• The issue confirms compatibility with macOS due to a successful local macOS arm64 build.
• The focus of the issue is the update of the libwebp library, which is not covered by current labels.
• There are no concerns regarding performance, reliability, or compatibility with the previous version of SkiaSharp.
• The issue does not relate to any backend technology or graphics API associated with available labels.

Summary of the actions that will be performed:

Action	Item	Description
Apply Label	os/macOS	The issue mentions the successful build on macOS arm64, indicating macOS compatibility.

This entire triage process was automated by AI and mistakes may have been made. Please let us know so we can continue to improve.