TST: Fix linkcheck cron directive [ci skip]
TST: Fix linkcheck cron directive [ci skip]

dhomeier/astropy,larrybradley/astropy,saimn/astropy,pllim/astropy,stargaser/astropy,aleksandr-bakanov/astropy,StuartLittlefair/astropy,lpsinger/astropy,pllim/astropy,larrybradley/astropy,larrybradley/astropy,dhomeier/astropy,pllim/astropy,lpsinger/astropy,MSeifert04/astropy,MSeifert04/astropy,dhomeier/astropy,StuartLittlefair/astropy,larrybradley/astropy,saimn/astropy,dhomeier/astropy,astropy/astropy,saimn/astropy,saimn/astropy,mhvk/astropy,aleksandr-bakanov/astropy,pllim/astropy,astropy/astropy,MSeifert04/astropy,StuartLittlefair/astropy,mhvk/astropy,StuartLittlefair/astropy,aleksandr-bakanov/astropy,mhvk/astropy,saimn/astropy,astropy/astropy,stargaser/astropy,dhomeier/astropy,pllim/astropy,MSeifert04/astropy,astropy/astropy,mhvk/astropy,lpsinger/astropy,StuartLittlefair/astropy,astropy/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,larrybradley/astropy,lpsinger/astropy,mhvk/astropy,stargaser/astropy,stargaser/astropy