gitlab-ci: Revert Windows builds from MSVC 14.33 to MSVC 14.32 toolset

Revert commit 6f17996edc (gitlab-ci: Update Windows builds to MSVC 14.33
toolset, 2022-08-15).  A `cmake-gui` built with the MSVC 14.33 toolset
emits spurious errors when configuring CMake projects, even when the
adjacent `cmake` binary succeeds reliably.  Revert to the known-working
MSVC 14.32 toolset pending further investigation.

Issue: #23859