Update Rust crate lettre to 0.11.6

Author: renovate-bot

Cargo.lock

@@ -31,7 +31,7 @@ eyre = "0.6.12"
 git2 = "0.18.3"
 k8s-openapi = { version = "0.20.0", features = ["v1_26"] }
 kube = { version = "0.87.2", features = ["derive", "runtime"] }
-lettre = { version = "0.11.5", features = ["tokio1", "tracing", "tokio1-native-tls"] }
+lettre = { version = "0.11.6", features = ["tokio1", "tracing", "tokio1-native-tls"] }
 mustache = "0.9.0"
 once_cell = "1.19.0"
 owo-colors = { version = "4.0.0", features = ["supports-colors"] }