Remove 'tower' dependency from lading/Cargo.toml (#1199)

This dependency was not in fact used by this crate. We remove it for the
sake of tidiness.

Signed-off-by: Brian L. Troutwine <[email protected]>

Author: blt

Cargo.lock

@@ -79,11 +79,6 @@ tokio = { workspace = true, features = [
 tokio-stream = { version = "0.1", features = ["io-util"] }
 tokio-util = { version = "0.7", features = ["io"] }
 tonic = { version = "0.12" }
-tower = { workspace = true, features = [
-  "timeout",
-  "limit",
-  "load-shed",
-] }
 tracing = { workspace = true }
 tracing-subscriber = { version = "0.3", features = ["std", "env-filter"] }
 uuid = { workspace = true }