Remove redundant maintainerships from @borsboom
Remove redundant maintainerships from @borsboom

All the removed packages are also listed under another maintainer, so no changes to what is in Stackage are expected.
int-index/stackage,iand675/stackage,asr/stackage,jonschoning/stackage,clinty/stackage,simonmichael/stackage,athanclark/stackage,fpco/stackage,fimad/stackage,soenkehahn/stackage,massysett/stackage,michalkonecny/stackage,wereHamster/stackage,mrkkrp/stackage,stackbuilders/stackage,spencerjanssen/stackage,Daniel-Diaz/stackage