Update GitHub Actions to latest versions

- Update actions/checkout from v3/v4 to v5
- Update actions/upload-artifact from v3 to v4

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

Co-Authored-By: Claude <[email protected]>

Author: ayonious

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
         java-version: [11, 17]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v5
 
     - name: Set up JDK ${{ matrix.java-version }}
       uses: actions/setup-java@v3
@@ -31,7 +31,7 @@ jobs:
 
     - name: Upload test results
       if: always()
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: test-results-java-${{ matrix.java-version }}
         path: target/surefire-reports/

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
 
     - name: Setup Java
       uses: actions/setup-java@v4