update config crate

Author: lovasoa

Cargo.lock

@@ -47,7 +47,7 @@ async-stream = "0.3"
 async-trait = "0.1.61"
 async-recursion = "1.0.0"
 include_dir = "0.7.2"
-config = { version = "0.14.0", features = ["json"] }
+config = { version = "0.15.4", features = ["json"] }
 markdown = { version = "1.0.0-alpha.15", features = ["log"] }
 password-hash = "0.5.0"
 argon2 = "0.5.0"