Help: Update MSVC_VERSION range for VS 17.10's MSVC 14.40 toolset

Brad Kingrequested to merge
brad.king/cmake:msvc-v143-versions into master

According to this blog post the 14.40 through 14.49 version range will be used by the v143 toolsets.

Backport: release
Fixes: #26015 (closed)

Edited by Brad King

Merge request reports