Roll Flutter Engine from 42f4998f8d74 to 6f9ac80e56c4 (1 revision) (#112622)

diff --git a/bin/internal/engine.version b/bin/internal/engine.version
index 8a4ef15..e221b67 100644
--- a/bin/internal/engine.version
+++ b/bin/internal/engine.version
@@ -1 +1 @@
-42f4998f8d74558f88146ad95f85c313179204f0
+6f9ac80e56c4693a4c8770f69c563ee3705bfeef