Release 3.47 (#2879)

Minor updates for release 3.47

## Pre-launch Checklist

- [x] I read the [Flutter Style Guide] _recently_, and have followed its
advice.
- [x] I signed the [CLA].
- [x] I read the [Contributors Guide].
- [x] I have added sample code updates to the [changelog].
- [x] I updated/added relevant documentation (doc comments with `///`).


If you need help, consider asking for advice on the #hackers-devrel
channel on [Discord].

<!-- Links -->
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/master/docs/contributing/Style-guide-for-Flutter-repo.md
[CLA]: https://cla.developers.google.com/
[Discord]:
https://github.com/flutter/flutter/blob/master/docs/contributing/Chat.md
[Contributors Guide]:
https://github.com/flutter/samples/blob/main/CONTRIBUTING.md
[changelog]: ../CHANGELOG.md

---------

Co-authored-by: Parker Lougheed <parlough@gmail.com>

asset_transformation/grayscale_transformer/analysis_options.yaml

@@ -1,30 +1,10 @@
-# This file configures the static analysis results for your project (errors,
-# warnings, and lints).
-#
-# This enables the 'recommended' set of lints from `package:lints`.
-# This set helps identify many issues that may lead to problems when running
-# or consuming Dart code, and enforces writing Dart using a single, idiomatic
-# style and format.
-#
-# If you want a smaller set of lints you can change this to specify
-# 'package:lints/core.yaml'. These are just the most critical lints
-# (the recommended set includes the core lints).
-# The core lints are also what is used by pub.dev for scoring packages.
-
-include: package:lints/recommended.yaml
-
-# Uncomment the following section to specify additional rules.
-
-# linter:
-#   rules:
-#     - camel_case_types
-
-# analyzer:
-#   exclude:
-#     - path/to/excluded/files/**
-
-# For more information about the core and recommended set of lints, see
-# https://dart.dev/go/core-lints
-
-# For additional information about configuring this file, see
-# https://dart.dev/guides/language/analysis-options
+analyzer:
+  exclude:
+    - build/**
+    - android/**
+    - ios/**
+    - web/**
+    - windows/**
+    - macos/**
+    - linux/**
+include: ../../analysis_options.yaml

asset_transformation/grayscale_transformer/bin/grayscale_transformer.dart

@@ -16,8 +16,8 @@ int main(List<String> arguments) {
     ..addOption(outputOptionName, mandatory: true, abbr: 'o');
 
   ArgResults argResults = parser.parse(arguments);
-  final String inputFilePath = argResults[inputOptionName];
-  final String outputFilePath = argResults[outputOptionName];
+  final String inputFilePath = argResults[inputOptionName] as String;
+  final String outputFilePath = argResults[outputOptionName] as String;
 
   try {
     final Image image = decodeImage(File(inputFilePath).readAsBytesSync())!;

asset_transformation/test/main_test.dart

@@ -1,8 +1,8 @@
-import 'package:flutter_test/flutter_test.dart';
 import 'package:asset_transformation/main.dart';
+import 'package:flutter_test/flutter_test.dart';
 
 void main() {
-  testWidgets('app can render without exceptions', (WidgetTester tester) async {
+  testWidgets('app can render without exceptions', (tester) async {
     await tester.pumpWidget(const MainApp());
   });
 }