Pin Windows CUDA CI job to windows-2022

The windows-latest runner image now ships Visual Studio 2026, whose
host compiler is rejected by CUDA 12.4's nvcc (only VS 2017-2022 are
supported), breaking CMake's CUDA compiler detection at configure time.
Pin the CUDA Windows build to windows-2022 until the toolchain catches
up. The non-CUDA Windows job stays on windows-latest.

Signed-off-by: Gary Oberbrunner <garyo@darkstarsystems.com>

Author: garyo

.github/workflows/build.yml

@@ -147,7 +147,9 @@ jobs:
           - name_prefix: Windows
             release_prefix: windows
             ostype: windows
-            os: windows-latest
+            # Pin to VS2022; CUDA 12.4 nvcc rejects the VS2026 host compiler
+            # shipped on windows-latest. See host_config.h version check.
+            os: windows-2022
             has_cmake_presets: true
             buildtype: Release
             conan_version: 2.20.1