Revert "Use std::sync::Condvar (openethereum#1732)" (openethereum#9392)

* Revert "Use std::sync::Condvar (openethereum#1732)"

This reverts commit c65ee93.

* verification_queue: remove redundant mutexes

Merge branch 'generate-json-rpc-doc' of https://github.com/cpurta/par…

…ity-ethereum into cpurta-generate-json-rpc-doc-03

Merge branch 'master' into cpurta-generate-json-rpc-doc

Merge branch 'generate-json-rpc-doc' of https://github.com/cpurta/par…

…ity-ethereum into cpurta-generate-json-rpc-doc

Update snapcraft.yaml (openethereum#9132)

`evm bench` fix broken dependencies (openethereum#9134)

* `evm bench` use valid dependencies

Benchmarks of the `evm` used stale versions of a couple a crates that
this commit fixes!

* fix warnings