TST: switch to use numpy nightly
TST: switch to use numpy nightly

StuartLittlefair/astropy,pllim/astropy,astropy/astropy,aleksandr-bakanov/astropy,StuartLittlefair/astropy,aleksandr-bakanov/astropy,saimn/astropy,saimn/astropy,dhomeier/astropy,larrybradley/astropy,astropy/astropy,dhomeier/astropy,aleksandr-bakanov/astropy,aleksandr-bakanov/astropy,pllim/astropy,mhvk/astropy,saimn/astropy,saimn/astropy,mhvk/astropy,mhvk/astropy,StuartLittlefair/astropy,pllim/astropy,lpsinger/astropy,dhomeier/astropy,dhomeier/astropy,mhvk/astropy,StuartLittlefair/astropy,lpsinger/astropy,mhvk/astropy,pllim/astropy,lpsinger/astropy,larrybradley/astropy,larrybradley/astropy,larrybradley/astropy,lpsinger/astropy,saimn/astropy,StuartLittlefair/astropy,larrybradley/astropy,astropy/astropy,astropy/astropy,astropy/astropy,lpsinger/astropy,dhomeier/astropy,pllim/astropy