Bump flutter to a38c5c628774a5e5a4e11ceeee6d5bc6a509eef0 (#9987)

flutter-candidate.txt

diff --git a/flutter-candidate.txt b/flutter-candidate.txt
index 22deb79..7227dfe 100644
--- a/flutter-candidate.txt
+++ b/flutter-candidate.txt
@@ -1 +1 @@
-d0da4767346ae787dc60168c8581e3e57ecda6b5
+a38c5c628774a5e5a4e11ceeee6d5bc6a509eef0

packages/devtools_app/benchmark/web_bundle_size_test.dart

diff --git a/packages/devtools_app/benchmark/web_bundle_size_test.dart b/packages/devtools_app/benchmark/web_bundle_size_test.dart
index 470d0c6..e55f570 100644
--- a/packages/devtools_app/benchmark/web_bundle_size_test.dart
+++ b/packages/devtools_app/benchmark/web_bundle_size_test.dart
@@ -12,7 +12,7 @@
 
 // Benchmark size in kB.
 const bundleSizeBenchmark = 5600;
-const gzipBundleSizeBenchmark = 1650;
+const gzipBundleSizeBenchmark = 1700;
 
 void main() {
   group('Web Compile', () {

packages/devtools_app/lib/src/screens/network/network_model.dart

diff --git a/packages/devtools_app/lib/src/screens/network/network_model.dart b/packages/devtools_app/lib/src/screens/network/network_model.dart
index 7154f67..76af3a9 100644
--- a/packages/devtools_app/lib/src/screens/network/network_model.dart
+++ b/packages/devtools_app/lib/src/screens/network/network_model.dart
@@ -4,7 +4,6 @@
 
 import 'package:devtools_shared/devtools_shared.dart';
 import 'package:flutter/material.dart';
-import 'package:meta/meta.dart';
 import 'package:vm_service/vm_service.dart';
 
 import '../../shared/primitives/utils.dart';