TST: lift xfail from tests fixed upstream in matplotlib
TST: lift xfail from tests fixed upstream in matplotlib

Fixes #11267.

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