ci: Update GitHub Actions to latest versions

- Update actions/checkout from v2.3.4 to v4
- Update subosito/flutter-action from v1.5.3 to v2
- Update actions/upload-artifact from v2 to v4
- Pin Flutter version to 3.27.2 for consistency

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: cfsmp3

.github/workflows/create_artifacts.yml

@@ -14,10 +14,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Check out repository
-      uses: actions/checkout@v2.3.4
+      uses: actions/checkout@v4
     - name: Install Flutter
-      uses: subosito/flutter-action@v1.5.3
+      uses: subosito/flutter-action@v2
       with:
+        flutter-version: '3.27.2'
         channel: 'stable'
     - name: Flutter format
       run: |
@@ -34,10 +35,11 @@ jobs:
     runs-on: windows-latest
     steps:
     - name: Check out repository
-      uses: actions/checkout@v2.3.4
+      uses: actions/checkout@v4
     - name: Install Flutter
-      uses: subosito/flutter-action@v1.5.3
+      uses: subosito/flutter-action@v2
       with:
+        flutter-version: '3.27.2'
         channel: 'stable'
     - name: Enable desktop support
       run: flutter config --enable-windows-desktop
@@ -50,7 +52,7 @@ jobs:
         Copy-Item (vswhere -latest -find 'VC\Redist\MSVC\*\x64\*\vcruntime140_1.dll') .
       working-directory: ./build/windows/runner/Release
     - name: Create artifact
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         name: CCExtractor Flutter GUI Windows
         path: |
@@ -63,10 +65,11 @@ jobs:
       runs-on: ubuntu-latest
       steps:
       - name: Check out repository
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v4
       - name: Install Flutter
-        uses: subosito/flutter-action@v1.5.3
+        uses: subosito/flutter-action@v2
         with:
+          flutter-version: '3.27.2'
           channel: 'stable'
       - name: Enable desktop support
         run: |
@@ -75,7 +78,7 @@ jobs:
       - name: Build Linux app
         run: flutter build linux
       - name: Create artifact
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: CCExtractor Flutter GUI Linux
           path: ./build/linux/x64/release/bundle/

.github/workflows/create_releases.yml

@@ -10,10 +10,11 @@ jobs:
     runs-on: windows-latest
     steps:
     - name: Check out repository
-      uses: actions/checkout@v2.3.4
+      uses: actions/checkout@v4
     - name: Install Flutter
-      uses: subosito/flutter-action@v1.5.3
+      uses: subosito/flutter-action@v2
       with:
+        flutter-version: '3.27.2'
         channel: 'stable'
     - name: Enable desktop support
       run: flutter config --enable-windows-desktop
@@ -34,16 +35,17 @@ jobs:
       uses: AButler/upload-release-assets@v2.0
       with:
         files: './windows.zip'
-        repo-token: ${{ secrets.GITHUB_TOKEN }}      
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
 
   build_linux:
     runs-on: ubuntu-latest
     steps:
     - name: Check out repository
-      uses: actions/checkout@v2.3.4
+      uses: actions/checkout@v4
     - name: Install Flutter
-      uses: subosito/flutter-action@v1.5.3
+      uses: subosito/flutter-action@v2
       with:
+        flutter-version: '3.27.2'
         channel: 'stable'
     - name: Enable desktop support
       run: |
@@ -60,4 +62,4 @@ jobs:
       uses: AButler/upload-release-assets@v2.0
       with:
         files: './linux.zip'
-        repo-token: ${{ secrets.GITHUB_TOKEN }}      
+        repo-token: ${{ secrets.GITHUB_TOKEN }}