CircleCI: update version of docker images
CircleCI: update version of docker images
StuartLittlefair/astropy,lpsinger/astropy,dhomeier/astropy,DougBurke/astropy,lpsinger/astropy,saimn/astropy,aleksandr-bakanov/astropy,MSeifert04/astropy,dhomeier/astropy,lpsinger/astropy,astropy/astropy,pllim/astropy,pllim/astropy,DougBurke/astropy,StuartLittlefair/astropy,stargaser/astropy,StuartLittlefair/astropy,MSeifert04/astropy,StuartLittlefair/astropy,saimn/astropy,lpsinger/astropy,saimn/astropy,aleksandr-bakanov/astropy,dhomeier/astropy,larrybradley/astropy,MSeifert04/astropy,pllim/astropy,astropy/astropy,larrybradley/astropy,mhvk/astropy,pllim/astropy,astropy/astropy,DougBurke/astropy,bsipocz/astropy,aleksandr-bakanov/astropy,stargaser/astropy,pllim/astropy,mhvk/astropy,astropy/astropy,stargaser/astropy,dhomeier/astropy,larrybradley/astropy,bsipocz/astropy,bsipocz/astropy,DougBurke/astropy,larrybradley/astropy,astropy/astropy,mhvk/astropy,stargaser/astropy,lpsinger/astropy,dhomeier/astropy,MSeifert04/astropy,mhvk/astropy,larrybradley/astropy,saimn/astropy,saimn/astropy,StuartLittlefair/astropy,aleksandr-bakanov/astropy,bsipocz/astropy,mhvk/astropy