worker: Remove unused direct dependency declaration

Author: Turbo87

Cargo.lock

@@ -9,7 +9,6 @@ workspace = true
 
 [dependencies]
 anyhow = "=1.0.95"
-deadpool-diesel = { version = "=0.6.1", features = ["postgres", "tracing"] }
 diesel = { version = "=2.2.7", features = ["postgres", "serde_json"] }
 diesel-async = { version = "=0.5.2", features = ["async-connection-wrapper", "deadpool", "postgres"] }
 futures-util = "=0.3.31"