Clean out old tox jobs

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist= py38,style
+envlist= py38,py39,py39
 isolated_build = True
 
 [testenv]
@@ -19,7 +19,7 @@ deps=
     legacy: numpy~=1.18
     legacy: pytest~=6.0.0
     legacy: astropy~=5.0.4
-    numpydev,s390x: cython
+    numpydev: cython
 extras= all,tests
 # astropy will complain if the home directory is missing
 passenv= HOME
@@ -28,30 +28,6 @@ commands=
     pip freeze
     pytest --remote-data
 
-[testenv:egg_info]
-deps=
-commands=
-    python setup.py egg_info
-
-[testenv:docbuild]
-extras= docs
-commands=
-    pip freeze
-    sphinx-build -W docs build/docs
-
-[testenv:checkdocs]
-deps=
-    collective.checkdocs
-    pygments
-commands=
-    python setup.py checkdocs
-
-[testenv:style]
-deps=
-    flake8
-commands=
-    flake8 --count
-
 # coverage run must be used because the pytest-asdf plugin will interfere
 # with proper coverage measurement due to the order pytest loads its
 # entry points.
@@ -71,19 +47,3 @@ extras= all,tests
 commands=
     pip freeze
     pytest compatibility_tests/ --remote-data
-
-[testenv:bandit]
-deps=
-    bandit
-    toml
-commands=
-    bandit -c bandit.yaml -r .
-
-[testenv:codestyle]
-skip_install = true
-description = Run all style and file checks with pre-commit
-deps =
-    pre-commit
-commands =
-    pre-commit install-hooks
-    pre-commit run {posargs:--color always --all-files --show-diff-on-failure}