.github: fix vcvarsall.bat path

.github/workflows/main.yml

@@ -39,7 +39,7 @@ jobs:
             git clone https://github.com/dbartolini/crown
         - name: windows-make-debug64
           run: |
-            cd "C:\Program Files(x86)\Microsoft Visual Studio 14.0\VC\"
+            cd "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build"
             .\vcvarsall.bat
             cd "D:\a\crown\crown"
             cd "3rdparty\luajit\src"