Update versioning check script

[area]

Prior to the release of IMWSS2, the last-but-one-release (HMWSS) used npm. After IMWSS2, the last-but-one-release (IMWSS) uses pnpm. So the version check script needs to be updated.

What confused me was that it was silently failing, when I added set -e recently to avoid exactly this scenario.

It turns out, if you carefully inspect the documentation:

              -e    ...  The shell does not exit if the command that fails is part of the command list
                      immediately following a while or until keyword, part of the test following  the  if
                      or  elif reserved words, part of any command executed in a && or || list except the
                      command following the final && or ||, any command in a pipeline but the last, or if
                      the command's return value is being inverted with !. 

So I have removed the use of && to avoid a situation like this cropping up in the future.