Fix overly pessimistic polar motion warning, fixes #10645
Fix overly pessimistic polar motion warning, fixes #10645

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