Update GitHub Actions workflow for improved build process

Author: yknishidate

.github/workflows/build.yml

@@ -22,10 +22,8 @@ jobs:
 
     - name: Install Vulkan SDK
       run: |
-          $ver = (Invoke-WebRequest -Uri "https://vulkan.lunarg.com/sdk/latest.json" | ConvertFrom-Json).windows
-          echo Version $ver
           $ProgressPreference = 'SilentlyContinue'
-          Invoke-WebRequest -Uri "https://sdk.lunarg.com/sdk/download/$ver/windows/VulkanSDK-$ver-Installer.exe" -OutFile VulkanSDK.exe
+          Invoke-WebRequest -Uri "https://sdk.lunarg.com/sdk/download/1.4.304.0/windows/VulkanSDK-1.4.304.0-Installer.exe" -OutFile VulkanSDK.exe
           echo Downloaded
           .\VulkanSDK.exe --root C:\VulkanSDK  --accept-licenses --default-answer --confirm-command install