unused dep references? (#5954)

Got a hunch ( from undepend ) that these are not needed.

Author: gilescope

crates/bevy_core_pipeline/Cargo.toml

@@ -19,7 +19,6 @@ webgl = []
 [dependencies]
 # bevy
 bevy_app = { path = "../bevy_app", version = "0.9.0-dev" }
-bevy_asset = { path = "../bevy_asset", version = "0.9.0-dev" }
 bevy_derive = { path = "../bevy_derive", version = "0.9.0-dev" }
 bevy_ecs = { path = "../bevy_ecs", version = "0.9.0-dev" }
 bevy_reflect = { path = "../bevy_reflect", version = "0.9.0-dev" }

crates/bevy_sprite/Cargo.toml

@@ -30,6 +30,5 @@ fixedbitset = "0.4"
 guillotiere = "0.6.0"
 thiserror = "1.0"
 rectangle-pack = "0.4"
-serde = { version = "1", features = ["derive"] }
 bitflags = "1.2"
 copyless = "0.1.5"

crates/bevy_tasks/Cargo.toml

@@ -10,7 +10,6 @@ keywords = ["bevy"]
 
 [dependencies]
 futures-lite = "1.4.0"
-event-listener = "2.5.2"
 async-executor = "1.3.0"
 async-channel = "1.4.2"
 num_cpus = "1"