chore!: update Dart version constraints to ">=3.0.0 <4.0.0" (#115)

* chore: update Dart version constraints

* ci: update main.yaml dependency step

* chore: bump min SDK in workflow to 2.17.0

* chore: bump version constraints

* chore: bump example SDK version

.github/workflows/main.yaml

@@ -13,10 +13,42 @@ jobs:
     uses: VeryGoodOpenSource/very_good_workflows/.github/workflows/semantic_pull_request.yml@v1
 
   build:
-    uses: VeryGoodOpenSource/very_good_workflows/.github/workflows/flutter_package.yml@v1
-    with:
-      flutter_channel: stable
-      flutter_version: 3.13.3
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        dart-version:
+          - "3.0.0" # The minimum Dart SDK version supported by the package.
+          - "stable"
+
+    steps:
+      # Consider replacing this with Very Good Workflows' dart_package, once the following
+      # issue is resolved:
+      # https://github.com/VeryGoodOpenSource/very_good_workflows/issues/151
+      - name: 📚 Git Checkout
+        uses: actions/checkout@v4
+
+      - name: 🎯 Setup Dart
+        uses: dart-lang/setup-dart@v1
+        with:
+          sdk: ${{ matrix.dart-version }}
+
+      - name: 📦 Install Dependencies
+        run: dart pub get --no-example
+
+      - name: ✨ Check Formatting
+        run: dart format --set-exit-if-changed lib test
+
+      - name: 🕵️ Analyze
+        run: dart analyze --fatal-infos --fatal-warnings lib test
+
+      - name: 🧪 Run Tests
+        run: |
+          dart pub global activate coverage 1.2.0
+          dart test -j 4 --coverage=coverage --platform="vm" && dart pub global run coverage:format_coverage --lcov --check-ignore --in=coverage --out=coverage/lcov.info --packages=.dart_tool/package_config.json --report-on="lib,test"
+
+      - name: 📊 Check Code Coverage
+        uses: VeryGoodOpenSource/very_good_coverage@v2
 
   spell-check:
     uses: VeryGoodOpenSource/very_good_workflows/.github/workflows/spell_check.yml@v1.11.0

example/pubspec.yaml

@@ -4,7 +4,7 @@ version: 1.0.0+1
 publish_to: none
 
 environment:
-  sdk: ">=2.19.0 <3.0.0"
+  sdk: ">=3.0.0 <4.0.0"
 
 dependencies:
   flutter:

pubspec.yaml

@@ -8,7 +8,7 @@ documentation: https://github.com/VeryGoodOpenSource/formz
 version: 0.6.1
 
 environment:
-  sdk: ">=2.14.0 <3.0.0"
+  sdk: ">=3.0.0 <4.0.0"
 
 dependencies:
   meta: ^1.7.0