updating tox tests

tox.ini

@@ -1,17 +1,15 @@
 [tox]
 envlist =
-    py{37,38,39,310}-test{,-alldeps,-devdeps}{,-cov}
-    py{37,38,39,310}-test-numpy{118,119,120,121}
-    py{37,38,39,310}-test-astropy{40,50}
+    py{39,310,311,312}-test{,-alldeps}{,-cov}
     build_docs
     linkcheck
     codestyle
 requires =
     setuptools >= 30.3.0
     pip >= 19.3.1
 isolated_build = true
-indexserver =
-    NIGHTLY = https://pypi.anaconda.org/scipy-wheels-nightly/simple
+#indexserver =
+#    NIGHTLY = https://pypi.anaconda.org/scipy-wheels-nightly/simple
 
 [testenv]
 # Suppress display of matplotlib plots generated during docs build
@@ -38,29 +36,18 @@ description =
     devdeps: with the latest developer version of key dependencies
     oldestdeps: with the oldest supported version of key dependencies
     cov: and test coverage
-    numpy118: with numpy 1.18.*
-    numpy119: with numpy 1.19.*
-    numpy120: with numpy 1.20.*
-    numpy121: with numpy 1.21.*
-    astropy40: with astropy 4.0.*
-    astropy50: with astropy 5.0.*
+    numpy122: with numpy 1.22.*
+    numpy123: with numpy 1.23.*
     astropylts: with the latest astropy LTS (currently v5.0)
 
 # The following provides some specific pinnings for key packages
 deps =
 
-    numpy118: numpy==1.18.*
-    numpy119: numpy==1.19.*
-    numpy120: numpy==1.20.*
-    numpy121: numpy==1.21.*
+    numpy122: numpy==1.22.*
+    numpy123: numpy==1.23.*
 
-    astropy40: astropy==4.0.*
-    astropy50: astropy==5.0.*
     astropylts: astropy==5.0.*
 
-    devdeps: :NIGHTLY:numpy
-    devdeps: git+https://github.com/astropy/astropy.git#egg=astropy
-
 # The following indicates which extras_require from setup.cfg will be installed
 extras =
     test