TST: Reorder things for luck

because really dunno what to do

tox.ini

@@ -12,7 +12,7 @@ isolated_build = true
 # Suppress display of matplotlib plots generated during docs build
 setenv =
     MPLBACKEND=agg
-    devdeps: PIP_EXTRA_INDEX_URL = https://pypi.anaconda.org/astropy/simple https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
+    devdeps: PIP_EXTRA_INDEX_URL = https://pypi.anaconda.org/scientific-python-nightly-wheels/simple https://pypi.anaconda.org/astropy/simple
 
 # Pass through the following environment variables which may be needed for the CI
 passenv = HOME,WINDIR,LC_ALL,LC_CTYPE,CC,CI
@@ -51,9 +51,9 @@ deps =
     oldestdeps: matplotlib==3.6.*
     oldestdeps: dask==2023.2.0
 
+    devdeps: astropy>=0.0.dev0
     devdeps: numpy>=0.0.dev0
     devdeps: scipy>=0.0.dev0
-    devdeps: astropy>=0.0.dev0
     devdeps: git+https://github.com/spacetelescope/gwcs.git
     devdeps: git+https://github.com/asdf-format/asdf.git
     devdeps: git+https://github.com/astropy/asdf-astropy.git