Bump h5py from 2.10.0 to 3.2.1 (#749)

Bumps [h5py](https://github.com/h5py/h5py) from 2.10.0 to 3.2.1.
- [Release notes](https://github.com/h5py/h5py/releases)
- [Changelog](https://github.com/h5py/h5py/blob/master/docs/release_guide.rst)
- [Commits](h5py/h5py@2.10.0...3.2.1)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements_dev_optional.txt

@@ -16,7 +16,7 @@ coverage
 flake8==3.9.2
 pytest-cov==2.12.0
 pytest-doctestplus==0.4.0
-h5py==2.10.0
+h5py==3.2.1
 s3fs==2021.5.0
 fsspec==2021.5.0
 moto[server]>=1.3.14