tower-abci: bump [email protected] and prep 0.19 (#59)

Bumps tower to v0.5 to match the rest of the ecosystem (tonic, axum).

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "tower-abci"
-version = "0.18.0"
+version = "0.19.0"
 authors = [
   "Penumbra Labs <[email protected]>",
   "Henry de Valence <[email protected]"
@@ -17,17 +17,19 @@ documentation = "https://docs.rs/tower-abci"
 tendermint-proto = "0.40"
 tendermint = "0.40"
 bytes = "1"
-tokio = { version = "1", features = ["full"]}
+tokio = { version = "1", features = ["io-util", "macros", "net", "rt"] }
 tokio-util = { version = "0.6", features = ["codec"] }
 tokio-stream = "0.1"
-tower = { version = "0.4", features = ["full"]}
+tower = { version = "0.5", features = ["util"] }
 pin-project = "1"
 futures = "0.3"
 tracing = "0.1"
 prost = "0.13"
 
 [dev-dependencies]
 structopt = "0.3"
+tokio = { version = "1", features = ["rt-multi-thread"] }
+tower = {version = "0.5", features = ["buffer", "limit", "load-shed"] }
 tracing-subscriber = "0.3.17"
 
 [features]