Lock Dart Version to Major Release Version

Changed the dart version in the GitHub Actions files to reflect the
major release version. This means it will grab the latest patch for that
specific release.

Author: beanbeanjuice

.github/workflows/dart.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Setup Dart SDK
         uses: dart-lang/setup-dart@v1  # https://github.com/dart-lang/setup-dart
         with:
-          sdk: 3.7.3
+          sdk: 3.7
 
       - name: Install dependencies
         run: dart pub get

.github/workflows/dart_formatting.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Setup Dart SDK
         uses: dart-lang/setup-dart@v1  # https://github.com/dart-lang/setup-dart
         with:
-          sdk: 3.7.3
+          sdk: 3.7
 
       - name: Install dependencies
         run: dart pub get

.github/workflows/gh-pages-dev.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Setup Dart SDK
         uses: dart-lang/setup-dart@v1  # https://github.com/dart-lang/setup-dart
         with:
-          sdk: 3.7.3
+          sdk: 3.7
 
       - name: Install dependencies
         run: dart pub get

.github/workflows/gh-pages.yml

@@ -22,7 +22,7 @@ jobs:
       - name: Setup Dart SDK
         uses: dart-lang/setup-dart@v1  # https://github.com/dart-lang/setup-dart
         with:
-          sdk: 3.7.3
+          sdk: 3.7
 
       - name: Install dependencies
         run: dart pub get