Roll Dart SDK from 9807b83d5945 to d2ee73b2513c (5 revisions) (#18526)

DEPS

diff --git a/DEPS b/DEPS
index 99b38ab..4c152e7 100644
--- a/DEPS
+++ b/DEPS
@@ -34,7 +34,7 @@
   # 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': '9807b83d5945737bee990535b692ecec19774f54',
+  'dart_revision': 'd2ee73b2513c1070c6d69f6d9a25c7dbc1aaa1da',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py

ci/licenses_golden/licenses_third_party

diff --git a/ci/licenses_golden/licenses_third_party b/ci/licenses_golden/licenses_third_party
index 1b22a90..3f8474c 100644
--- a/ci/licenses_golden/licenses_third_party
+++ b/ci/licenses_golden/licenses_third_party
@@ -1,4 +1,4 @@
-Signature: 318a911481d75c340e3561593238d07c
+Signature: 5533da765bee3caf81a763a019389266
 
 UNUSED LICENSES: