[GITHUB] build-msbuild-i386: Upgrade to "Visual Studio 18 2026"

from "Visual Studio 17 2022".

Author: SergeGautherie

.github/workflows/build.yml

@@ -311,7 +311,7 @@ jobs:
 
   build-msbuild-i386:
     name: MSBuild (i386)
-    runs-on: windows-latest
+    runs-on: windows-2025-vs2026
     steps:
     - name: Install Flex and Bison
       run: |