MAINT: use the scientific python extra pip index for dev wheels

Author: bsipocz

tox.ini

@@ -8,6 +8,9 @@ requires =
 
 description = run tests
 
+setenv =
+    devdeps: PIP_EXTRA_INDEX_URL =  https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
+
 deps =
     # We use these files to specify all the dependencies, and below we override
     # versions for specific testing schenarios
@@ -24,11 +27,11 @@ deps =
 allowlist_externals = bash
 
 commands =
-    devdeps: pip install -U --pre --only-binary :all: -i https://pypi.anaconda.org/scipy-wheels-nightly/simple numpy
-    devdeps: pip install -U --pre --only-binary :all: -i https://pypi.anaconda.org/scipy-wheels-nightly/simple scipy
-    devdeps: pip install -U --pre --only-binary :all: -i https://pypi.anaconda.org/scipy-wheels-nightly/simple matplotlib
-    devdeps: pip install -U --pre --only-binary :all: -i https://pypi.anaconda.org/scipy-wheels-nightly/simple pandas
-    devdeps: pip install -U --pre --only-binary :all: -i https://pypi.anaconda.org/scipy-wheels-nightly/simple statsmodels
+    devdeps: numpy>=0.0.dev0
+    devdeps: scipy>=0.0.dev0
+    devdeps: matplotlib>=0.0.dev0
+    devdeps: pandas>=0.0.dev0
+    devdeps: statmodels>=0.0.dev0
 
     pip freeze