Update loofah and crass gems to match GitLab CE/EE
This saves some disk space and reduces install time.
loofah 2.4.0 changes: https://github.com/flavorjones/loofah/blob/master/CHANGELOG.md#240--2019-11-25
crass 1.05 changes: https://github.com/rgrove/crass/blob/master/HISTORY.md
Edited by GitLab Release Tools Bot