[PRQ#46176] Deletion Request for slimerjs

MarsSeed [1] filed a deletion request for slimerjs [2]: Discontinued browser automation framework from 2018 for Firefox 59 and earlier: not useful to keep. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/slimerjs/