chore: remove forked dependencies

[theBeardA]

Rust currently doesn't allow a direct way of overriding major versions of transitive dependencies.
One workaround was to fork dependency repos and override those versions in Cargo.toml

the related issue on rust repo: rust-lang/cargo#5640

if and once this is resolved, we should remove forked repos and use overriding technique.

The current forked repos are(please add to list if we add more):

• https://github.com/b0xtch/blockstore
• https://github.com/theBeardA/forest-rocksdb