spec/gemfiles/rails_5_2.gemfile: Bump git dep versions
spec/gemfiles/rails_5_2.gemfile: Bump git dep versions

thredded/thredded,jayroh/thredded,thredded/thredded,jayroh/thredded,thredded/thredded,jayroh/thredded,thredded/thredded,jayroh/thredded