Duplicated dependencies

[hinto-janai]

What

As of commit ba0f82c3562dd16f55079e0c4591cf3ed8be874d, Cuprate's workspace Cargo.toml builds some duplicated dependencies.

Dependency	Versions
bitflags	v1.3.2, v2.4.2
hashbrown	v0.12.3, v0.14.3
indexmap	v1.9.3, v2.2.2
parking_lot	v0.11.2, v0.12.1
parking_lot_core	v0.8.6, v0.9.9

The full list can be seen with cargo tree -d.

There are some same-version dependencies that are built twice with different features (libc, proc-macro2, syn, quote) but I believe cargo only builds them once with a union of the features selected: https://doc.rust-lang.org/cargo/commands/cargo-tree.html#feature-unification.

Todo

Eventually, de-duplicating as many dependencies (as much as possible...) should be done.

The current list isn't too bad, but it may grow as more dependencies are added.