remove tokio dependency

Cargo.toml

@@ -39,7 +39,6 @@ futures = "0.3"
 crc32fast = "1"
 intmap = "2"
 moka = { version = "0.12", optional = true, features = ["sync"] }
-tokio = { version = "1.27.0", features = ["rt", "sync"], optional = true}
 async-broadcast = { version = "0.7.1", optional = true }
 async-lock = {version = "3.4.0", optional = true }
 
@@ -65,7 +64,7 @@ tracing-subscriber = { version = "0.3.16", features = ["env-filter", "fmt"] }
 default = ["tokio", "sparse"]
 replication = ["dep:async-broadcast", "dep:async-lock"]
 sparse = ["random-access-disk/sparse"]
-tokio = ["dep:tokio", "random-access-disk/tokio"]
+tokio = ["random-access-disk/tokio"]
 async-std = ["random-access-disk/async-std"]
 cache = ["moka"]
 # Used only in interoperability tests under tests/js-interop which use the javascript version of hypercore