Update test-log dev-dependency to 0.2.14

This change updates the test-log dev-dependency we use to version
0.2.14. In this version the crate no longer requires users to manually
include dependencies, such as tracing-subscriber. Hence, remove it.

Cargo.toml

@@ -51,9 +51,8 @@ websocket-util = "0.12.0"
 
 [dev-dependencies]
 serial_test = {version = "2.0.0", default-features = false}
-test-log = {version = "0.2.8", default-features = false, features = ["trace"]}
+test-log = {version = "0.2.14", default-features = false, features = ["trace"]}
 tokio = {version = "1.0", default-features = false, features = ["rt-multi-thread", "macros"]}
-tracing-subscriber = {version = "0.3", default-features = false, features = ["ansi", "env-filter", "fmt"]}
 uuid = {version = "1.0", default-features = false, features = ["v4"]}
 websocket-util = {version = "0.12.0", features = ["test"]}