Revert "Roll Dart to 45f9462398ae7d2e80acd79d3f9c32c7ca6f6f97 (#23307)" (#23315)

This reverts commit fb72fa5c635a914ed298e428633c7ac26541bafd.
diff --git a/bin/internal/engine.version b/bin/internal/engine.version
index 18e6da7..0202f3b 100644
--- a/bin/internal/engine.version
+++ b/bin/internal/engine.version
@@ -1 +1 @@
-7d49036d8b14f679509e64bff6f91644cbe11151
+2707b7433874a8b03e4a1f7341d45b5cdcc8dfc6