community/imv: update to new upstream repository

Closed mailinglist-bot requested to merge patches/3793 into master

Patchset from Pranjal Kole pranjal.kole7@gmail.com via aports #3793:

imv's upstream repository has moved from https://github.com/eXeC64/imv
to https://sr.ht/~exec64/imv.

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