fix(deps): update rust crate rustls to 0.21.9

Author: renovate[bot]

Cargo.toml

@@ -16,7 +16,7 @@ dotenv = { version = "0.15.0", features = ["clap"] }
 opentelemetry = { version = "0.18.0", features = ["trace", "rt-tokio", "metrics"] }
 opentelemetry-prometheus = "0.11.0"
 prometheus = { version = "0.13.3", features = ["process"] }
-rustls = { version = "0.20.7" }
+rustls = { version = "0.21.9" }
 rustls-pemfile = "1.0.1"
 serde = { version = "1.0.152", features = ["derive"] }
 serde_json = "1.0.91"