Remove phadej mentions from build-constraints
Remove phadej mentions from build-constraints

- julian karni weren't active in servant maintenance,
  i'm not active either
- I don't know why I was under `arithmoi` (maybe integer-logarithms, but
  that's grandfathered dependency atm)
- futurice don't have any projects on stackage afaik,
  and I'm not even employee for some time already.

This leaves servant unmaintined on Stackage, so anyone
is free to grab that.

massysett/stackage,fpco/stackage,stackbuilders/stackage,Daniel-Diaz/stackage,asr/stackage,jonschoning/stackage,athanclark/stackage,soenkehahn/stackage,clinty/stackage,michalkonecny/stackage,mrkkrp/stackage,simonmichael/stackage,iand675/stackage