make clippy happy by removing unused imports

plume-common/src/activity_pub/mod.rs

@@ -7,7 +7,6 @@ use rocket::{
     response::{Responder, Response, Result},
     Outcome,
 };
-use serde_json;
 
 use self::sign::Signable;
 

plume-common/src/activity_pub/request.rs

@@ -1,4 +1,3 @@
-use base64;
 use chrono::{offset::Utc, DateTime};
 use openssl::hash::{Hasher, MessageDigest};
 use reqwest::header::{HeaderMap, HeaderValue, ACCEPT, CONTENT_TYPE, DATE, USER_AGENT};

plume-common/src/activity_pub/sign.rs

@@ -1,10 +1,7 @@
 use super::request;
-use base64;
 use chrono::{naive::NaiveDateTime, DateTime, Duration, Utc};
-use hex;
 use openssl::{pkey::PKey, rsa::Rsa, sha::sha256};
 use rocket::http::HeaderMap;
-use serde_json;
 
 /// Returns (public key, private key)
 pub fn gen_keypair() -> (Vec<u8>, Vec<u8>) {