Roll Flutter Engine from ac6cb9f24494 to a5489ce4f9f9 (4 revisions) (#112210)

diff --git a/bin/internal/engine.version b/bin/internal/engine.version
index eae3d98..91122e2 100644
--- a/bin/internal/engine.version
+++ b/bin/internal/engine.version
@@ -1 +1 @@
-ac6cb9f2449430fcb668239437003ed122fe715e
+a5489ce4f9f9544cac6b8190fa721bbfd6f425de