Use latest lints, require Dart 2.19 or later (dart-lang/markdown#524)

pkgs/markdown/.github/workflows/test-package.yml

diff --git a/pkgs/markdown/.github/workflows/test-package.yml b/pkgs/markdown/.github/workflows/test-package.yml
index ddbee3f..467a534 100644
--- a/pkgs/markdown/.github/workflows/test-package.yml
+++ b/pkgs/markdown/.github/workflows/test-package.yml
@@ -47,7 +47,7 @@
       matrix:
         # Add macos-latest and/or windows-latest if relevant for this package.
         os: [ubuntu-latest]
-        sdk: [2.17.0, dev]
+        sdk: [2.19.0, dev]
     steps:
       - uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c
       - uses: dart-lang/setup-dart@a57a6c04cf7d4840e88432aad6281d1e125f0d46

pkgs/markdown/CHANGELOG.md

diff --git a/pkgs/markdown/CHANGELOG.md b/pkgs/markdown/CHANGELOG.md
index c27b69e..bcfa926 100644
--- a/pkgs/markdown/CHANGELOG.md
+++ b/pkgs/markdown/CHANGELOG.md
@@ -1,5 +1,6 @@
 ## 7.0.2-dev
 
+* Require Dart 2.19
 * Fix an issue in `HeaderWithIdSyntax`, do not generate heading IDs for headings
   with no content.
 

pkgs/markdown/pubspec.yaml

diff --git a/pkgs/markdown/pubspec.yaml b/pkgs/markdown/pubspec.yaml
index bdc3dcb..125f193 100644
--- a/pkgs/markdown/pubspec.yaml
+++ b/pkgs/markdown/pubspec.yaml
@@ -9,7 +9,7 @@
   markdown:
 
 environment:
-  sdk: '>=2.17.0 <3.0.0'
+  sdk: '>=2.19.0 <3.0.0'
 
 dependencies:
   args: ^2.0.0
@@ -20,7 +20,7 @@
   build_version: ^2.0.3
   build_web_compilers: '>=3.0.0 <5.0.0'
   collection: ^1.15.0
-  dart_flutter_team_lints: ^0.1.0
+  dart_flutter_team_lints: ^1.0.0
   html: ^0.15.0
   http: ^0.13.5
   io: ^1.0.0

pkgs/markdown/test/markdown_test.dart

diff --git a/pkgs/markdown/test/markdown_test.dart b/pkgs/markdown/test/markdown_test.dart
index aa6d9ce..d78409a 100644
--- a/pkgs/markdown/test/markdown_test.dart
+++ b/pkgs/markdown/test/markdown_test.dart
@@ -3,6 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 @TestOn('vm')
+library;
 
 import 'package:markdown/markdown.dart';
 import 'package:test/test.dart';

pkgs/markdown/test/version_test.dart

diff --git a/pkgs/markdown/test/version_test.dart b/pkgs/markdown/test/version_test.dart
index e92b80d..de61dde 100644
--- a/pkgs/markdown/test/version_test.dart
+++ b/pkgs/markdown/test/version_test.dart
@@ -3,6 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 @TestOn('vm')
+library;
 
 import 'dart:io';