Roll engine 88facf405434..7ecc879ffd9a (1 commits) (#22835)

https://github.com/flutter/engine/compare/88facf405434...7ecc879ffd9a

git log 88facf405434..7ecc879ffd9a --no-merges --oneline
7ecc879ff Fix failing test on Cirrus (flutter/engine#6469)


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bin/internal/engine.version

-88facf405434f9ca6741bb7c471e1e953e3bb5be
+7ecc879ffd9a2371a0bbb828a3dc9f7c4264aba5