add alternative checksums for steve & alex
add alternative checksums for steve & alex

using the latest version of lwip, the images don't have an alpha channel anymore

apparently before @94322f3 npm thought 'crafatar/lwip' means git tag v0.0.5
and after that commit, using 'EyalAr/lwip' it noticed there's a v0.0.6

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wat.

crafatar/crafatar,crafatar/crafatar,crafatar/crafatar