Update Rust crate mailchecker to 6.0.4

geneit_backend/Cargo.lock

@@ -1985,9 +1985,9 @@ dependencies = [
 
 [[package]]
 name = "mailchecker"
-version = "6.0.3"
+version = "6.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8e885debd7ec404b1f061a9c8ccd089ec31180264992d0549b669dd16cb3b1b3"
+checksum = "50fe9af5b3c83b106d841a2f93808ec8009d4b2fb229308cb729c3db601b8e15"
 dependencies = [
  "fast_chemail",
  "once_cell",

geneit_backend/Cargo.toml

@@ -19,7 +19,7 @@ futures-util = "0.3.30"
 diesel = { version = "2.1.6", features = ["postgres"] }
 serde = { version = "1.0.198", features = ["derive"] }
 serde_json = "1.0.116"
-mailchecker = "6.0.3"
+mailchecker = "6.0.4"
 redis = "0.25.3"
 lettre = "0.11.6"
 rand = "0.8.5"