simplelru: update dependencies

protosink: update dependencies

memcache: update dependencies

groupcache: update dependencies

chore: update darvaza.org/core

chores: fix spelling errors, update build system and copyright year o…

…n LICENCE.txt files

simplelru: update darvaza.org/core

simplelru: update golang.org/x/net

memcache: update dependencies

cache: update golang.org/x/net