Roll Dart SDK from b2550fec823c to 689440e4d163 (1 revision) (#40218) Roll Dart SDK from b2550fec823c to 689440e4d163 (1 revision)

diff --git a/DEPS b/DEPS
index 84989a9..c29538a 100644
--- a/DEPS
+++ b/DEPS

@@ -48,7 +48,7 @@
   # Dart is: https://github.com/dart-lang/sdk/blob/main/DEPS
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': 'b2550fec823cf59b36b18fe6d94a6ffe3ebe4980',
+  'dart_revision': '689440e4d16326ed59fe8d7185a81ce1402a4430',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py