update downstream warning filters

tox.ini

@@ -127,8 +127,7 @@ commands_pre =
     pip install -r {env_tmp_dir}/requirements.txt
     pip freeze
 commands=
-    pytest astropy/astropy/io/misc/asdf --open-files --run-slow --remote-data \
-        -W "ignore::asdf.exceptions.AsdfDeprecationWarning:asdf.entry_points"
+    pytest astropy/astropy/io/misc/asdf --open-files --run-slow --remote-data
 
 [testenv:asdf-astropy]
 change_dir = {env_tmp_dir}