chore(deps): update rust crate tokio-zookeeper to 0.4 (#811)

* chore(deps): update rust crate tokio-zookeeper to 0.3

* Replace failure with snafu

Depends on stackabletech/tokio-zookeeper#44

* tokio-zookeeper 0.4.0

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Co-authored-by: Natalie Klestrup Röijezon <nat@nullable.se>
Co-authored-by: Sebastian Bernauer <sebastian.bernauer@stackable.de>

Author: 3 people