Merge branch 'renovate/lettre-0.x' into 'master'

Update Rust crate lettre to 0.11.7

See merge request !24

Cargo.toml

@@ -10,7 +10,7 @@ fantoccini = "0.19.3"
 penguin-config = "0.1.1"
 serde = "1.0.200"
 tokio = { version = "1", features = ["full"] }
-lettre = { version = "0.11.1", features = [
+lettre = { version = "0.11.7", features = [
   "smtp-transport",
   "native-tls",
 ] }