TST: use h5py nighlties in bleeding-edge CI

.github/workflows/bleeding-edge.yaml

@@ -1,6 +1,6 @@
 name: CI (bleeding edge)
 # goals: check stability against
-# - dev version of numpy, matplotlib, scipy and astropy
+# - dev version of numpy, matplotlib, scipy, h5py and astropy
 # - building with future pip default options
 
 on:
@@ -36,7 +36,7 @@ jobs:
         python -m pip install --upgrade pip
         python -m pip install --upgrade setuptools wheel
         python -m pip install --pre --only-binary ":all:" \
-          numpy matplotlib scipy \
+          numpy matplotlib scipy h5py \
           --extra-index-url \
           https://pypi.anaconda.org/scientific-python-nightly-wheels/simple