Bump h5py from 3.3.0 to 3.4.0 (#818)

Bumps [h5py](https://github.com/h5py/h5py) from 3.3.0 to 3.4.0.
- [Release notes](https://github.com/h5py/h5py/releases)
- [Changelog](https://github.com/h5py/h5py/blob/master/docs/release_guide.rst)
- [Commits](h5py/h5py@3.3.0...3.4.0)

---
updated-dependencies:
- dependency-name: h5py
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

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

Author: dependabot[bot]

requirements_dev_optional.txt

@@ -16,7 +16,7 @@ coverage
 flake8==3.9.2
 pytest-cov==2.12.1
 pytest-doctestplus==0.10.1
-h5py==3.3.0
+h5py==3.4.0
 s3fs==2021.6.0
 fsspec==2021.6.0
 aiobotocore!=1.4.0