Upgrade run-vcpkg to v6

Author: mrts

.github/workflows/cmake-windows.yml

@@ -14,7 +14,7 @@ jobs:
       uses: actions/checkout@v2
 
     - name: Prepare vcpkg and libraries
-      uses: lukka/run-vcpkg@v2
+      uses: lukka/run-vcpkg@v6
       with:
         vcpkgArguments: gtest:x64-windows
         vcpkgTriplet: x64-windows