CI: Fix mistake in manually executable Windows-Tests.yml

Author: ptheywood

.github/workflows/Windows-Tests.yml

@@ -26,6 +26,7 @@ jobs:
           - cuda: "12.6.0"
             cuda_arch: "50"
             hostcxx: "Visual Studio 17 2022"
+            os: windows-2022
           - cuda: "12.0.0"
             cuda_arch: "50"
             hostcxx: "Visual Studio 16 2019"