Update dependencies and add CI workflows

- Update dependencies in pubspec.yaml.
- Add Dart analyze workflow (`.github/workflows/analyze.yaml`).
- Add Dart format workflow (`.github/workflows/format.yaml`) that creates PRs for formatting changes.
- Fix dead code in example.
- Ignore .flutter-plugins-dependencies.

Author: google-labs-jules[bot]

.github/workflows/analyze.yaml

@@ -0,0 +1,18 @@
+name: Analyze
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  analyze:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: subosito/flutter-action@v2
+        with:
+          channel: 'stable'
+      - run: flutter pub get
+      - run: dart analyze .

.github/workflows/format.yaml

@@ -0,0 +1,31 @@
+name: Format
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  format:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.head_ref }}
+      - uses: subosito/flutter-action@v2
+        with:
+          channel: 'stable'
+      - run: dart format lib example
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v6
+        with:
+          commit-message: 'style: format code'
+          title: 'style: format code'
+          body: 'Format code using `dart format`.'
+          branch: 'format-fix-${{ github.head_ref || github.ref_name }}'
+          delete-branch: true

.gitignore

@@ -31,3 +31,4 @@ migrate_working_dir/
 **/doc/api/
 .dart_tool/
 build/
+.flutter-plugins-dependencies

example/unix_single_instance_example.dart

@@ -18,12 +18,10 @@ void main(List<String> arguments) async {
   if (Platform.isLinux) {
     if (!await unixSingleInstance(arguments, cmdProcessor)) {
       exit(0);
-      return;
     }
   } else if (Platform.isMacOS) {
     if (!await unixSingleInstance(arguments, cmdProcessor)) {
       exit(0);
-      return;
     }
   }
 }

pubspec.yaml

@@ -10,12 +10,12 @@ environment:
   flutter: ">=2.5.0"
 
 dependencies:
-  args: ^2.4.2
-  path: ^1.9.0
-  path_provider: ^2.1.3
+  args: ^2.7.0
+  path: ^1.9.1
+  path_provider: ^2.1.5
 
 dev_dependencies:
-  lints: ^3.0.0
+  lints: ^6.0.0
 
 # This package supports only Linux and macOS.
 platforms: