Remove the futures dependencies
#468
Merged
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Step towards #133
This PR gets rid of the dependency towards
futures, and replaces it with others such asasync-lock,futures-channelandfutures-util.async-lockhas the advantage that it is built on top ofevents_listener, and thatevents_listenersupportsno_stdexcept for the fact that no version has been published yet (smol-rs/event-listener#34).In other words,
async-lockcan be madeno_stdquite easily, as opposed tofutureswhich is likely never going to happen.