Roll Dart SDK from 29265c94a6e8 to 35269fa71956 (1 revision) (flutter/engine#50402)

https://dart.googlesource.com/sdk.git/+log/29265c94a6e8..35269fa71956

2024-02-06 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com Version 3.4.0-115.0.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 chinmaygarde@google.com,dart-vm-team@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://issues.skia.org/issues/new?component=1389291&template=1850622

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

DEPS

@@ -62,7 +62,7 @@ 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': '29265c94a6e83e1a66015e76754a1b2a2540ea0c',
+  'dart_revision': '35269fa71956e0c8eb919dda7176e0fb0ede7f1f',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -77,7 +77,7 @@ vars = {
   'dart_perfetto_rev': '13ce0c9e13b0940d2476cd0cff2301708a9a2e2b',
   'dart_protobuf_gn_rev': 'ca669f79945418f6229e4fef89b666b2a88cbb10',
   'dart_protobuf_rev': 'a293fb9c866b1def3d3e7fffc5f6763a2ec59cc9',
-  'dart_pub_rev': 'a3689f03168c896dd1cb0db8a60c568b38ee16bf',
+  'dart_pub_rev': '4ab2e3663f0a98be40427e004e789caebf3ea72e',
   'dart_tools_rev': 'f6e67f2223fd5f9c6bdb3ace908d22c73ea02bc5',
   'dart_watcher_rev': '66cd694ffb7ee6e09ff0cde6c9f788aa47ee1a23',
   'dart_webdev_rev': '2539d54bca7143a2dd1a1ec5d55fa38ca481639c',