Update Rust crate tracing-subscriber to 0.3

Author: renovate-bot

Cargo.lock

@@ -85,7 +85,7 @@ thiserror = "=1.0.30"
 tokio = { version = "=1.15.0", features = ["net", "signal", "io-std", "io-util", "rt-multi-thread", "macros"]}
 toml = "=0.5.8"
 tracing = "=0.1.29"
-tracing-subscriber = "=0.2.25"
+tracing-subscriber = "=0.3.6"
 url = "=2.2.2"
 
 [dev-dependencies]