VisualStudio: relax VS versions gerenating .vs/

VS 2026 still generates `.vs/`.

FYI no documentation has been found on `site:visualstudio.microsoft.com` for this behavior by VS.

https://stackoverflow.com/questions/31878901

Refs: git-for-windows/build-extra#762

VisualStudio.gitignore

@@ -53,7 +53,7 @@ bld/
 # (https://github.com/github/gitignore/pull/3736)
 #!**/[Bb]in/*.refresh
 
-# Visual Studio 2015/2017 cache/options directory
+# Cache/options directory generated by Visual Studio since 2015
 .vs/
 # Uncomment if you have tasks that create the project's static files in wwwroot
 #wwwroot/