Roll engine 832cdacc6f95..849fa42a06a5 (4 commits) (#32735)

https://github.com/flutter/engine/compare/832cdacc6f95...849fa42a06a5

git log 832cdacc6f955f080734109900a1658ae7e0d248..849fa42a06a5c09ade2d88e48d982e069f68d969 --no-merges --oneline
849fa42a0 Revert "Roll src/third_party/dart a0290f823c..6d5f763952 (70 commits)" (flutter/engine#8969)
10742e77a Roll src/third_party/dart a0290f823c..6d5f763952 (70 commits)
55ff8d60b Revert "Roll src/third_party/dart a0290f823c..6d5f763952 (70 commits)" (flutter/engine#8966)
704b6eead Roll src/third_party/dart a0290f823c..6d5f763952 (70 commits)

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

If the roll is causing failures, please contact the current sheriff (jsimmons@google.com), and stop
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bin/internal/engine.version

-832cdacc6f955f080734109900a1658ae7e0d248
+849fa42a06a5c09ade2d88e48d982e069f68d969