update lints, require Dart 3.1 (dart-lang/string_scanner#76)

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

diff --git a/pkgs/string_scanner/.github/workflows/test-package.yml b/pkgs/string_scanner/.github/workflows/test-package.yml
index 58a2061..b65aeef 100644
--- a/pkgs/string_scanner/.github/workflows/test-package.yml
+++ b/pkgs/string_scanner/.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: [3.0.0, dev]
+        sdk: [3.1, dev]
     steps:
       - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29
       - uses: dart-lang/setup-dart@f0ead981b4d9a35b37f30d36160575d60931ec30

pkgs/string_scanner/CHANGELOG.md

diff --git a/pkgs/string_scanner/CHANGELOG.md b/pkgs/string_scanner/CHANGELOG.md
index fa7af43..386a55b 100644
--- a/pkgs/string_scanner/CHANGELOG.md
+++ b/pkgs/string_scanner/CHANGELOG.md
@@ -1,6 +1,6 @@
 ## 1.2.1-wip
 
-* Require Dart 3.0.0
+* Require Dart 3.1.0
 
 ## 1.2.0
 

pkgs/string_scanner/pubspec.yaml

diff --git a/pkgs/string_scanner/pubspec.yaml b/pkgs/string_scanner/pubspec.yaml
index 7ceb7d9..eea570a 100644
--- a/pkgs/string_scanner/pubspec.yaml
+++ b/pkgs/string_scanner/pubspec.yaml
@@ -4,11 +4,11 @@
 repository: https://github.com/dart-lang/string_scanner
 
 environment:
-  sdk: ^3.0.0
+  sdk: ^3.1.0
 
 dependencies:
   source_span: ^1.8.0
 
 dev_dependencies:
-  dart_flutter_team_lints: ^2.0.0
-  test: ^1.16.0
+  dart_flutter_team_lints: ^3.0.0
+  test: ^1.16.6