Roll Dart SDK from b95f6531c726 to 8f8f281ccdc6 (2 revisions) (#43607)

https://dart.googlesource.com/sdk.git/+log/b95f6531c726..8f8f281ccdc6

2023-07-12 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com Version 3.1.0-302.0.dev
2023-07-12 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com Version 3.1.0-301.0.dev

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/dart-sdk-flutter-engine
Please CC dart-vm-team@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter Engine: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Author: skia-flutter-autoroll

DEPS

@@ -53,7 +53,7 @@ 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': 'b95f6531c726b454ed57eaa69319cf704649cdef',
+  'dart_revision': '8f8f281ccdc670e304c122c77050d9dd31356c1e',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -332,7 +332,7 @@ deps = {
    Var('chromium_git') + '/external/github.com/WebAssembly/binaryen.git@b9b5f162ca8bf5b899ff0f0351491d7d403d7ed9',
 
   'src/third_party/dart/third_party/devtools':
-   {'packages': [{'version': 'git_revision:99dca813aaa7fa23ccd6fe3901ac7665e96db3cb', 'package': 'dart/third_party/flutter/devtools'}], 'dep_type': 'cipd'},
+   {'dep_type': 'cipd', 'packages': [{'package': 'dart/third_party/flutter/devtools', 'version': 'git_revision:99dca813aaa7fa23ccd6fe3901ac7665e96db3cb'}]},
 
   'src/third_party/dart/third_party/pkg/args':
    Var('dart_git') + '/args.git@da56b18ebcb600e050bf57b9c1103b1d2a9fb2ff',
@@ -407,7 +407,7 @@ deps = {
    Var('dart_git') + '/leak_tracker.git@85bd7fb23bfdfdcc66390e8d6ae81aafd65fe51e',
 
   'src/third_party/dart/third_party/pkg/linter':
-   Var('dart_git') + '/linter.git@e8c878360595c1d268d93f54c09bc843815a42d7',
+   Var('dart_git') + '/linter.git@655de5d0dc30cdd1df9ce4cd16bd7489106d987f',
 
   'src/third_party/dart/third_party/pkg/logging':
    Var('dart_git') + '/logging.git@521498757ed3eeae151c2d4796404e8947baa04c',
@@ -506,7 +506,7 @@ deps = {
    Var('dart_git') + '/yaml_edit.git' + '@' + Var('dart_yaml_edit_rev'),
 
   'src/third_party/dart/tools/sdks/dart-sdk':
-   {'packages': [{'version': 'version:3.1.0-155.0.dev', 'package': 'dart/dart-sdk/${{platform}}'}], 'dep_type': 'cipd'},
+   {'dep_type': 'cipd', 'packages': [{'package': 'dart/dart-sdk/${{platform}}', 'version': 'version:3.1.0-155.0.dev'}]},
 
   # WARNING: end of dart dependencies list that is cleaned up automatically - see create_updated_flutter_deps.py.
 

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: 2da4bd9577ddf4b32a27495b12806add
+Signature: 01d2a2135abeb752cf16b45b5baf3798
 
 ====================================================================================================
 LIBRARY: angle