We used to have this historically due to bots which were running on
Node.js 14. Node.js 14 was shipping NPM 7 back in the days.
Now all bots are on >= Node.js 16 so we can remove this legacy code.
Since yesterday all our windows bots are dying while trying to
install npm@8.
Turns out this is due to recent release of npm@8.4. This patch
moves our CI to use npm@8.3
https://github.com/npm/cli/issues/4341
