Update action/upload-artifact to v4

See https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/

Author: aristotelos

.github/workflows/build.yml

@@ -45,7 +45,7 @@ jobs:
       working-directory: ./src
 
     - name: Upload build artifacts
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: FlaUI.WebDriver
         path: ./src/FlaUI.WebDriver/bin/Release/win-x64/publish