Fix CI workflow by updating deprecated actions to v4

- Update actions/upload-artifact from v3 to v4
- Update actions/download-artifact from v3 to v4
- Resolves deprecated action warnings causing build failures

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

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

Author: pythonandchips

.github/workflows/build.yml

@@ -63,7 +63,7 @@ jobs:
         fi
     
     - name: Upload artifacts
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: git-presenter-${{ matrix.goos }}-${{ matrix.goarch }}
         path: dist/
@@ -77,7 +77,7 @@ jobs:
     - uses: actions/checkout@v4
 
     - name: Download all artifacts
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         path: dist