MNT: Do not auto update IERS on forks
MNT: Do not auto update IERS on forks

saimn/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,larrybradley/astropy,astropy/astropy,pllim/astropy,astropy/astropy,mhvk/astropy,lpsinger/astropy,astropy/astropy,StuartLittlefair/astropy,lpsinger/astropy,mhvk/astropy,pllim/astropy,lpsinger/astropy,StuartLittlefair/astropy,lpsinger/astropy,saimn/astropy,StuartLittlefair/astropy,mhvk/astropy,mhvk/astropy,astropy/astropy,saimn/astropy,saimn/astropy,saimn/astropy,larrybradley/astropy,pllim/astropy,astropy/astropy,lpsinger/astropy,pllim/astropy,larrybradley/astropy,larrybradley/astropy,mhvk/astropy,pllim/astropy,larrybradley/astropy