Roll Dart SDK from 0c2c331d64f3 to 764e72800f40 (15 revisions) (#19113)

DEPS

@@ -34,7 +34,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/master/DEPS.
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': '0c2c331d64f3e05a7aaa2169091e69cbe85283b9',
+  'dart_revision': '764e72800f405017eb6ec822a2b4c11e13b4aa15',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py

ci/licenses_golden/licenses_third_party

-Signature: d94547895d84dfaf78fbfff57d740c94
+Signature: b5736a286ec2b409430a063bf7fcdb15
 
 UNUSED LICENSES: