MNT: Install indexed_gzip on 3.12, add dev to all full,pre groups

Author: effigies

tox.ini

@@ -88,10 +88,9 @@ deps =
   py3{8,9}-full-x86,x64: matplotlib >=3.4
   # h5py stopped producing win32 wheels at py39
   py38-full-x86,x64: h5py >=2.10
-  full,pre: pillow >=8.1
-  # indexed_gzip missing py312 wheels
-  py3{8,9,10,11}-{full,pre}: indexed_gzip >=1.4
-  full,pre: pyzstd >=0.14.3
+  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