[flutter_releases] Flutter beta 3.12.0-0.1.pre Framework Cherrypicks (#129226)

update engine revision.

This PR is manually created since the conductor keeps reporting error
[gpaste link](https://paste.googleplex.com/6308585867837440)
diff --git a/bin/internal/engine.version b/bin/internal/engine.version
index 3762a61..d8f1aed 100644
--- a/bin/internal/engine.version
+++ b/bin/internal/engine.version
@@ -1 +1 @@
-b84ad1ad30cca8d303b4bcb2bbd77573e4d66122
+45712dd2f120092ca3c78d0098b12f0079fd966d