使っていない依存を削除

Author: hotate29

atcoder-problems-backend/Cargo.lock

@@ -12,7 +12,6 @@ fern = "0.6.1"
 
 rand = "0.8.4"
 chrono = "0.4"
-regex = "1"
 rust-s3 = { version = "0.27.0-rc4", features = ["no-verify-ssl"] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"