software/jstestnode: use https protocol to install from github

This prevents errors like:

Error while executing:
/srv/slapgrid/slappart54/t/dau/shared/git/f7efae57344573a59b9e441431a34e9a/bin/git ls-remote -h -t git://github.com/qunitjs/node-qunit.git

fatal: remote error:
  The unauthenticated git protocol on port 9418 is no longer supported.
Please see https://github.blog/2021-09-01-improving-git-protocol-security-github/ for more information.