Use single-threaded hashmap instead of dashmap

Address performance regressions

Cargo.toml

@@ -32,7 +32,6 @@ futures = "0.3"
 parking_lot = "0.12"
 dagx-macros = { version = "0.3.1", path = "./dagx-macros" }
 tracing = { version = "0.1", optional = true }
-dashmap = "6.1.0"
 
 [dev-dependencies]
 tokio = { version = "1", features = [