brittle test: kubo v0.13.0 introduced a breaking change to `ipfs block put`

[kubo v0.13.0](https://github.com/ipfs/kubo/releases/tag/v0.13.0) introduced a breaking change where CIDv1 are used by default instead of CIDv0 thus breaking the [`test_block#test_put` test](https://github.com/ipfs-shipyard/py-ipfs-http-client/blob/master/test/functional/test_block.py#L18).