MNT: Better sort of minimal dependencies

Author: effigies

tox.ini

@@ -65,19 +65,21 @@ pass_env =
   NIPY_EXTRA_TESTS
 extras = test
 deps =
+  # General minimum dependencies: pin based on API usage
+  min: packaging ==17
+  min: importlib_resources ==1.3; python_version < '3.9'
   # NEP29/SPEC0 + 1yr: Test on minor release series within the last 3 years
   # We're extending this to all optional dependencies
   # This only affects the range that we test on; numpy is the only non-optional
   # dependency, and will be the only one to affect pip environment resolution.
   min: numpy ==1.20
-  min: packaging ==17
-  min: importlib_resources ==1.3; python_version < '3.9'
-  min: scipy ==1.6
-  min: matplotlib ==3.4
   min: h5py ==2.10
-  min: pillow ==8.1
   min: indexed_gzip ==1.4
+  min: matplotlib ==3.4
+  min: pillow ==8.1
+  min: pydicom ==2.1
   min: pyzstd ==0.14.3
+  min: scipy ==1.6
   # Numpy 2.0 is a major breaking release; we cannot put much effort into
   # supporting until it's at least RC stable
   pre: numpy <2.0.dev0
@@ -91,7 +93,6 @@ deps =
   full,pre,dev: pillow >=8.1
   full,pre,dev: indexed_gzip >=1.4
   full,pre,dev: pyzstd >=0.14.3
-  min: pydicom ==2.1
   full,pre,dev: pydicom >=2.1
   # pydicom master seems to be breaking things
   # pre: pydicom @ git+https://github.com/pydicom/pydicom.git@main