Roll dart to 4738c1a (flutter#35691)

* Roll dart to 4738c1a

Changes since last dart roll
```
4738c1a Version 2.19.0-137.0.dev
84a39b0 [infra] Disable Goma on dartk-linux-release-riscv64-qemu.
69fcdc8 Version 2.19.0-136.0.dev
c0e74c4 [dart fix] report undefined diagnostics
7dfe682 Migration: _task is non-null
310d6d0 First draft of some process docs for the analyzer
39a6717 [vm] Don't run DFE with a low optimization threshold in profiler tests.
ece330a [analysis_server] Include annotation completions at end of class
2f3c69c Rename a subdirectory under doc to match what analysis_server has
00f032a [ VM / Service ] Add isolateGroupId to IsolateRef and Isolate
992672b [gardening] Fix gcc bot - add suggested parenthesis around '&&' within '||'
33846f3 [io/file] Add `exclusive` optional parameter to File.create, createSync.
f73f25e Revert to clang toolchain that was rolled in March
2b27d32 Report duplicated field names in record literals
65b4621 Fix an exception when a record type appears in an extends clause
8a883fa Change `:` to `=` for default values in `pkg`.
177147b [analysis_server] Improve handling of document modifications while computing completions
dbac2a4 [cfe] Add InternalRecordLiteral
```

* Update license hash

DEPS

@@ -36,7 +36,7 @@ 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': 'b535e8d0bfbedd5a7580a020befd1c46452ac633',
+  'dart_revision': '4738c1a1a514a1b4ed9f4df17f71e2c5d9011d7a',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -164,7 +164,7 @@ deps = {
   # WARNING: Unused Dart dependencies in the list below till "WARNING:" marker are removed automatically - see create_updated_flutter_deps.py.
 
   'src/third_party/dart/third_party/devtools':
-   {'packages': [{'version': 'git_revision:d131d19091f6b89ac89486bd92440a25a523e8b0', 'package': 'dart/third_party/flutter/devtools'}], 'dep_type': 'cipd'},
+   {'packages': [{'package': 'dart/third_party/flutter/devtools', 'version': 'git_revision:d131d19091f6b89ac89486bd92440a25a523e8b0'}], 'dep_type': 'cipd'},
 
   'src/third_party/dart/third_party/pkg/args':
    Var('dart_git') + '/args.git@80d4abbd6b38b79bcdbc411b4b517628c7611232',
@@ -329,7 +329,7 @@ deps = {
    Var('dart_git') + '/yaml_edit.git' + '@' + Var('dart_yaml_edit_rev'),
 
   'src/third_party/dart/tools/sdks':
-   {'packages': [{'version': 'version:2.18.0-271.7.beta', 'package': 'dart/dart-sdk/${{platform}}'}], 'dep_type': 'cipd'},
+   {'packages': [{'package': 'dart/dart-sdk/${{platform}}', 'version': 'version:2.18.0-271.7.beta'}], 'dep_type': 'cipd'},
 
   # WARNING: end of dart dependencies list that is cleaned up automatically - see create_updated_flutter_deps.py.
 
@@ -474,7 +474,7 @@ deps = {
   Var('github_git') + '/felangel/equatable.git' + '@' + '0ba67c72db8bed75877fc1caafa74112ee0bd921', # 2.0.2
 
   'src/third_party/pkg/file':
-  Var('github_git') + '/google/file.dart.git' + '@' + '427bb20ccc852425d67f2880da2a9b4707c266b4', # 6.1.0
+  Var('github_git') + '/google/file.dart.git' + '@' + 'b2e31cb6ef40b223701dbfa0b907fe58468484d7', # 6.1.4
 
   'src/third_party/pkg/flutter_packages':
   Var('github_git') + '/flutter/packages.git' + '@' + '26990a2f75ab2028c3c77ffc869db11d6d866d18', # various

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: 96a953f119145ece42ec4269764ead98
+Signature: a1657391084c65e081040f2a5a58b06e
 
 UNUSED LICENSES: