[flutter_releases] Flutter beta 2.6.0-5.2.pre Engine Cherrypicks (#28640)

* 'Update Dart SDK to d41cdbc054ce74d56b361334320a170a1289955c'
* 'add branch flutter-2.6-candidate.5 to enabled_branches in .ci.yaml'
* update licenses_third_party
diff --git a/.ci.yaml b/.ci.yaml
index fe65209..ade90c0 100644
--- a/.ci.yaml
+++ b/.ci.yaml
@@ -6,6 +6,7 @@
 # More information at:
 #  * https://github.com/flutter/cocoon/blob/master/CI_YAML.md
 enabled_branches:
+  - flutter-2.6-candidate.5
   - master
   - dev
   - beta
diff --git a/DEPS b/DEPS
index da281bd..7081382 100644
--- a/DEPS
+++ b/DEPS
@@ -39,7 +39,7 @@
   # 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': 'd6fa0d686082ec9f2957bce7e2de30b222fee082',
+  'dart_revision': 'd41cdbc054ce74d56b361334320a170a1289955c',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
diff --git a/ci/licenses_golden/licenses_third_party b/ci/licenses_golden/licenses_third_party
index cdb2a43..fae74ad 100644
--- a/ci/licenses_golden/licenses_third_party
+++ b/ci/licenses_golden/licenses_third_party
@@ -1,4 +1,4 @@
-Signature: 902cd27abf70686b2fe8cfe5ab8d655d
+Signature: cdf0987cd2f287be4eb9a9560ac0b5cc
 
 UNUSED LICENSES: