[PRQ#72216] Deletion Request for icu57

[notify]

MarsSeed [1] filed a deletion request for icu57 [2]:

Abandoned, no longer used EOL version from 2019, with packaging
issues.

[1] https://aur.archlinux.org/account/MarsSeed/
[2] https://aur.archlinux.org/pkgbase/icu57/