Avoid deprecation warning in wcsaxes doc
Avoid deprecation warning in wcsaxes doc

- Temporary fix to https://github.com/matplotlib/matplotlib/issues/19839,
- from https://github.com/astropy/astropy/pull/11118,
- closes (?) https://github.com/astropy/astropy/pull/11464

Co-authored-by: da39a3ee5e6b4b0d3255bfef95601890afd80709@pllim
Signed-off-by: Nathaniel Starkman (@nstarman) <ac14c573519de521a9fc5a84607d51c0c956190b@protonmail.com>

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