Roll engine f4951df193a7..471a2c89a689 (11 commits) (#28966)

https://github.com/flutter/engine/compare/f4951df193a7...471a2c89a689

git log f4951df193a7966f9ed4da43d555eee0913d84d1..471a2c89a689ff1d5c70a5deb4565f646380bce6 --no-merges --oneline
471a2c89a Send scroll events from the macOS shell (flutter/engine#8056)
2fe9c9b5f Roll src/third_party/skia 72542816cadb..801a9c16d81e (46 commits) (flutter/engine#8060)
3335764ae Skip skp files in license check (flutter/engine#8050)
7f16789b2 Remove redundant thread checker in FML. (flutter/engine#8053)
840c5233a Correct URL for Cirrus CI build status badge (flutter/engine#8054)
57c120a29 remove extra source files (flutter/engine#8052)
4773375c6 Used named conditionals for platform specific dependencies and suppress Android and Windows hooks on Mac. (flutter/engine#8051)
70a18b515 Add clang static analysis support to gn wrapper (flutter/engine#8047)
b30f9897b Improve elevation bounds for physical shape layers (flutter/engine#8044)
e37bd27b4 Fix weak pointer use violations in shell and platform view. (flutter/engine#8046)
dd80fc9ff Add engine support for scrollwheel events (flutter/engine#7494)

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https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

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bin/internal/engine.version

-f4951df193a7966f9ed4da43d555eee0913d84d1
+471a2c89a689ff1d5c70a5deb4565f646380bce6