Roll Dart SDK from 86242db to 874709e (1 revision) (flutter#22023)

Author: skia-flutter-autoroll

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': '86242db30c239b413a05299e17ebb1f361d3e83e',
+  'dart_revision': '874709e52a9955999ae5634a166341a333a92843',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -196,7 +196,7 @@ deps = {
    Var('dart_git') + '/dartdoc.git@8f5f30e58bbc0f11f104888ee87f11cbd6b82cc7',
 
   'src/third_party/dart/third_party/pkg/ffi':
-   Var('dart_git') + '/ffi.git@454ab0f9ea6bd06942a983238d8a6818b1357edb',
+   Var('dart_git') + '/ffi.git@a90bd424116fb6f416337db67425171f2dc4c98f',
 
   'src/third_party/dart/third_party/pkg/fixnum':
    Var('dart_git') + '/fixnum.git@16d3890c6dc82ca629659da1934e412292508bba',

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: 509e7a9cb38d82d2a9146c79da2c5656
+Signature: 05cfe341fa933d3a5579dc6246524c80
 
 UNUSED LICENSES: