Bump s3fs from 0.5.1 to 2021.5.0 (#758)
Bump s3fs from 0.5.1 to 2021.5.0 (#758)

* Bump s3fs from 0.5.1 to 2021.5.0

Bumps [s3fs](https://github.com/dask/s3fs) from 0.5.1 to 2021.5.0.
- [Release notes](https://github.com/dask/s3fs/releases)
- [Changelog](https://github.com/dask/s3fs/blob/main/release-procedure.md)
- [Commits](https://github.com/dask/s3fs/compare/0.5.1...2021.05.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

* Bump fsspec as well

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
Co-authored-by: jmoore <c028c213ed5efcf30c3f4fc7361dbde0c893c5b7@glencoesoftware.com>
zarr-developers/zarr-python