Merge pull request #1642 from tskit-dev/dependabot/pip/python/requirements/CI-docs/h5py-3.4.0

Bump h5py from 3.3.0 to 3.4.0 in /python/requirements/CI-docs

Author: mergify[bot]

python/requirements/CI-docs/requirements.txt

@@ -1,6 +1,6 @@
 autodocsumm==0.1.13 #Pinned as errors on 0.2.0
 breathe==4.30.0
-h5py==3.3.0
+h5py==3.4.0
 jsonschema==3.2.0
 numpy==1.21.2
 PyGithub==1.55