Update Rust crate tokio to 1.40.0 (#6855)

Cargo.toml

@@ -603,7 +603,7 @@ textwrap = "0.16.1"
 test-strategy = "0.3.1"
 thiserror = "1.0"
 tofino = { git = "https://github.com/oxidecomputer/tofino", branch = "main" }
-tokio = "1.39.3"
+tokio = "1.40.0"
 tokio-postgres = { version = "0.7", features = [ "with-chrono-0_4", "with-uuid-1" ] }
 tokio-stream = "0.1.16"
 tokio-tungstenite = "0.23.1"

workspace-hack/Cargo.toml

@@ -110,7 +110,7 @@ string_cache = { version = "0.8.7" }
 subtle = { version = "2.5.0" }
 syn-f595c2ba2a3f28df = { package = "syn", version = "2.0.79", features = ["extra-traits", "fold", "full", "visit", "visit-mut"] }
 time = { version = "0.3.36", features = ["formatting", "local-offset", "macros", "parsing"] }
-tokio = { version = "1.39.3", features = ["full", "test-util"] }
+tokio = { version = "1.40.0", features = ["full", "test-util"] }
 tokio-postgres = { version = "0.7.12", features = ["with-chrono-0_4", "with-serde_json-1", "with-uuid-1"] }
 tokio-stream = { version = "0.1.16", features = ["net", "sync"] }
 tokio-util = { version = "0.7.12", features = ["codec", "io-util"] }
@@ -224,7 +224,7 @@ syn-dff4ba8e3ae991db = { package = "syn", version = "1.0.109", features = ["extr
 syn-f595c2ba2a3f28df = { package = "syn", version = "2.0.79", features = ["extra-traits", "fold", "full", "visit", "visit-mut"] }
 time = { version = "0.3.36", features = ["formatting", "local-offset", "macros", "parsing"] }
 time-macros = { version = "0.2.18", default-features = false, features = ["formatting", "parsing"] }
-tokio = { version = "1.39.3", features = ["full", "test-util"] }
+tokio = { version = "1.40.0", features = ["full", "test-util"] }
 tokio-postgres = { version = "0.7.12", features = ["with-chrono-0_4", "with-serde_json-1", "with-uuid-1"] }
 tokio-stream = { version = "0.1.16", features = ["net", "sync"] }
 tokio-util = { version = "0.7.12", features = ["codec", "io-util"] }