Roll Flutter Engine from a10990314872 to b2855e074deb (7 revisions) (#123902)

Roll Flutter Engine from a10990314872 to b2855e074deb (7 revisions)

bin/internal/engine.version

diff --git a/bin/internal/engine.version b/bin/internal/engine.version
index 120a9f2..bcdb0b8 100644
--- a/bin/internal/engine.version
+++ b/bin/internal/engine.version
@@ -1 +1 @@
-a109903148725d475f0664f09cb2baaf93bfc8c8
+b2855e074deb1e2329aeb7f36b306fb0722d09dc