Roll Dart SDK from 996ef24 to 5ccf755 (1 revision) (#29568)

Author: skia-flutter-autoroll

DEPS

@@ -39,7 +39,7 @@ vars = {
   # 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': '996ef242a2c9a345fd092461049644fa61378445',
+  'dart_revision': '5ccf755b37a48bb59df5ba2e0fa5f5cafee59548',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -206,7 +206,7 @@ deps = {
    Var('dart_git') + '/crypto.git@b5024e4de2b1c474dd558bef593ddbf0bfade152',
 
   'src/third_party/dart/third_party/pkg/csslib':
-   Var('dart_git') + '/csslib.git@6f35da3d93eb56eb25925779d235858d4090ce6f',
+   Var('dart_git') + '/csslib.git@02abc1ddf93092efef2be365300f15504d23cd23',
 
   'src/third_party/dart/third_party/pkg/dartdoc':
    Var('dart_git') + '/dartdoc.git@520e64977de7a87b2fd5be56e5c2e1a58d55bdad',

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: 788a2e507b09e2d4f2bf0e5453739616
+Signature: 7870f11bd900421c426bcaf4a8ffd368
 
 UNUSED LICENSES: