MNT: Push h5py support back a bit

Author: effigies

tox.ini

@@ -61,14 +61,17 @@ deps =
   min: scipy ==1.6
   min: matplotlib ==3.4
   min: pillow ==8.1
-  min: h5py ==3.0
+  min: h5py ==2.10
   min: indexed_gzip ==1.4
   min: pyzstd ==0.14.3
+  # 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
   full,pre: scipy >=1.6
   full,pre: matplotlib >=3.4
   full,pre: pillow >=8.1
-  full: h5py >=3.0
+  # Exception: h5py 3.0.0 dropped win32 wheels, so extend back a little further
+  full: h5py >=2.10
   # h5py missing 3.12 wheels, so disable from pre for now
   # full,pre: h5py >=3.0
   full,pre: indexed_gzip >=1.4