Roll engine 66042161eba1..39c46dea4b73 (4 commits) (#28755)

https://github.com/flutter/engine/compare/66042161eba1...39c46dea4b73

git log 66042161eba17da968800c57ddd2c314cd787abb..39c46dea4b7347a252218aaff5caac5dc2fec8cd --no-merges --oneline
39c46dea4 Revert "Buffer lifecycle in WindowData (#7999)" (flutter/engine#8010)
293cfcaa5 Guard against using Android API not defined in API level 16 & 17 (flutter/engine#8006)
d7e0bc10c Roll src/third_party/skia 71a23d4195d9..e1f5b644656f (8 commits) (flutter/engine#8004)
0b1740171 Buffer lifecycle in WindowData (flutter/engine#7999)

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bin/internal/engine.version

-66042161eba17da968800c57ddd2c314cd787abb
+39c46dea4b7347a252218aaff5caac5dc2fec8cd