Update: Checkout actions to v5

Checkout Action Upgrade:
- Replace all checkout actions with 'actions/checkout@v5'
- Latest version with improved performance and features
- Better compatibility with modern Git workflows
- Enhanced security and reliability

 Updated Workflows:
- CI Pipeline: All checkout actions  v5
- Security Scans: All checkout actions  v5
- Release Pipeline: All checkout actions  v5
- Documentation: All checkout actions  v5

 Benefits:
- Latest checkout action features
- Improved performance and caching
- Better error handling and logging
- Enhanced Git LFS support
- Modern Node.js runtime compatibility

 All 4 workflow files updated consistently

.gitea/workflows/release.yml

@@ -7,7 +7,7 @@ on:
   workflow_dispatch:
     inputs:
       version:
-        description: 'Release version (e.g., v3.1.1)'
+        description: 'Release version (e.g., v3.1.2)'
         required: true
         type: string
 
@@ -28,7 +28,7 @@ jobs:
       
     steps:
     - name: Checkout code
-      uses: https://gitea.com/actions/checkout
+      uses: actions/checkout@v5
       with:
         fetch-depth: 0
         
@@ -74,7 +74,7 @@ jobs:
         
     steps:
     - name: Checkout code
-      uses: https://gitea.com/actions/checkout
+      uses: actions/checkout@v5
       
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4
@@ -112,7 +112,7 @@ jobs:
     
     steps:
     - name: Checkout code
-      uses: https://gitea.com/actions/checkout
+      uses: actions/checkout@v5
       
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v3
@@ -152,7 +152,7 @@ jobs:
     
     steps:
     - name: Checkout code
-      uses: https://gitea.com/actions/checkout
+      uses: actions/checkout@v5
       
     - name: Run Trivy vulnerability scanner
       uses: aquasecurity/trivy-action@master
@@ -181,7 +181,7 @@ jobs:
       
     steps:
     - name: Checkout code
-      uses: https://gitea.com/actions/checkout
+      uses: actions/checkout@v5
       
     - name: Deploy to production
       run: |