Roll Dart SDK from 6b2c3716be54 to 3b84125003a1 (1 revision) (#180316)

https://dart.googlesource.com/sdk.git/+log/6b2c3716be54..3b84125003a1

2025-12-26 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com
Version 3.11.0-273.0.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
Please CC codefu@google.com,dart-vm-team@google.com on the revert to
ensure that a human
is aware of the problem.

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https://github.com/flutter/flutter/issues/new/choose

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https://issues.skia.org/issues/new?component=1389291&template=1850622

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DEPS

diff --git a/DEPS b/DEPS
index 23bf3da..2abc189 100644
--- a/DEPS
+++ b/DEPS
@@ -59,13 +59,13 @@
   # updated revision list of existing dependencies. You will need to
   # gclient sync before and after update deps to ensure all deps are updated.
   # updated revision list of existing dependencies.
-  'dart_revision': '6b2c3716be5454108fbabfb7f6f4a6adc7012835',
+  'dart_revision': '3b84125003a1a462dc54799845468baa0c0acd1d',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
   'dart_ai_rev': '4eb2446144a8af374e08da8d3c743dcce129f87f',
   'dart_binaryen_rev': '6ec7b5f9c615d3b224c67ae221d6812c8f8e1a96',
-  'dart_boringssl_rev': '9d9b184ed9e7821dfb11cb757088ceacfa006fba',
+  'dart_boringssl_rev': 'a5eafaa42335cb9ad053a5df76d3bee022f40a8f',
   'dart_core_rev': 'cbb485437c61d37753bcc98818beca54d5b38f69',
   'dart_devtools_rev': 'bac6843cce3c98d8794a7cce796faaa8860cc00f',
   'dart_ecosystem_rev': 'eac66d93142907b39f2271647c111f36ff3365b9',