Roll engine and fix pubspecs that do not have a Dart SDK constraint (#70078)

bin/internal/engine.version

@@ -1 +1 @@
-0f7cdca65fba5619c02d00bb5faa40a4f1950df7
+3cf292226986c992090b3342b86e54c0f4ba7f75

dev/benchmarks/metrics_center/lib/google_benchmark.dart

@@ -2,6 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// This file uses Dart 2.12 semantics. This is needed as we can't upgrade
+// the SDK constraint to `>=2.12.0-0` before the deps are ready.
+// @dart=2.12
+
 import 'dart:convert';
 import 'dart:io';
 

dev/benchmarks/metrics_center/pubspec.yaml

@@ -1,5 +1,8 @@
 name: metrics_center
 
+environment:
+  sdk: '>=2.10.0 <3.0.0'
+
 dependencies:
   args: 1.6.0
   crypto: 2.1.5

dev/bots/analyze-sample-code.dart

@@ -491,6 +491,8 @@ class SampleChecker {
     final File analysisOptions = File(path.join(directory.path, 'analysis_options.yaml'))..createSync(recursive: true);
     pubSpec.writeAsStringSync('''
 name: analyze_sample_code
+environment:
+  sdk: '>=2.10.0 <3.0.0'
 dependencies:
   flutter:
     sdk: flutter

dev/tools/dartdoc.dart

@@ -56,6 +56,8 @@ Future<void> main(List<String> arguments) async {
   buf.writeln('homepage: https://flutter.dev');
   // TODO(dnfield): Re-factor for proper versioning, https://github.com/flutter/flutter/issues/55409
   buf.writeln('version: 0.0.0');
+  buf.writeln('environment:');
+  buf.writeln("  sdk: '>=2.10.0 <3.0.0'");
   buf.writeln('dependencies:');
   for (final String package in findPackageNames()) {
     buf.writeln('  $package:');

packages/flutter_tools/lib/src/commands/update_packages.dart

@@ -1259,6 +1259,8 @@ String _generateFakePubspec(Iterable<PubspecDependency> dependencies) {
   final StringBuffer result = StringBuffer();
   final StringBuffer overrides = StringBuffer();
   result.writeln('name: flutter_update_packages');
+  result.writeln('environment:');
+  result.writeln("  sdk: '>=2.10.0 <3.0.0'");
   result.writeln('dependencies:');
   overrides.writeln('dependency_overrides:');
   if (_kManuallyPinnedDependencies.isNotEmpty) {

packages/flutter_tools/test/commands.shard/hermetic/analyze_continuously_test.dart

@@ -4,20 +4,20 @@
 
 import 'dart:async';
 
+import 'package:file/memory.dart';
 import 'package:flutter_tools/src/artifacts.dart';
 import 'package:flutter_tools/src/base/common.dart';
-import 'package:flutter_tools/src/cache.dart';
-import 'package:mockito/mockito.dart';
-import 'package:file/memory.dart';
 import 'package:flutter_tools/src/base/file_system.dart';
 import 'package:flutter_tools/src/base/io.dart';
 import 'package:flutter_tools/src/base/logger.dart';
 import 'package:flutter_tools/src/base/platform.dart';
 import 'package:flutter_tools/src/base/terminal.dart';
+import 'package:flutter_tools/src/cache.dart';
 import 'package:flutter_tools/src/commands/analyze.dart';
 import 'package:flutter_tools/src/dart/analysis.dart';
 import 'package:flutter_tools/src/dart/pub.dart';
 import 'package:flutter_tools/src/globals.dart' as globals;
+import 'package:mockito/mockito.dart';
 import 'package:process/process.dart';
 
 import '../../src/common.dart';
@@ -55,6 +55,8 @@ void main() {
     final File pubspecFile = fileSystem.file(fileSystem.path.join(directory.path, 'pubspec.yaml'));
     pubspecFile.writeAsStringSync('''
   name: foo_project
+  environment:
+    sdk: '>=2.10.0 <3.0.0'
   ''');
 
     final File dartFile = fileSystem.file(fileSystem.path.join(directory.path, 'lib', 'main.dart'));

packages/flutter_tools/test/integration.shard/test_data/stepping_project.dart

@@ -8,6 +8,8 @@ class SteppingProject extends Project {
   @override
   final String pubspec = '''
   name: test
+  environment:
+    sdk: '>=2.10.0 <3.0.0'
   dependencies:
     flutter:
       sdk: flutter
@@ -62,6 +64,8 @@ class WebSteppingProject extends Project {
   @override
   final String pubspec = '''
   name: test
+  environment:
+    sdk: '>=2.10.0 <3.0.0'
   dependencies:
     flutter:
       sdk: flutter