Replace tokio mutex with std mutex

[ghost]

IMHO, I suggest that replacing tokio::sync::Mutex with std::sync::Mutex can potentially lead to better performance outcomes. This assertion is based on the design differences between the two mutex implementations, particularly in asynchronous contexts.

For further insights, check out the following resources:

Discussion on this topic. Never use Tokio mutexes.
tokio::sync::Mutex documentation.

[tasn]

Please feel free to open a PR!

[tasn]

Whoops, didn't mean to close it. :)