chore: update dependencies, including stable tokio

src/metrics.rs

@@ -20,8 +20,9 @@
 use crate::config::Config;
 use hyper::{
     header::CONTENT_TYPE,
+    server::Server,
     service::{make_service_fn, service_fn},
-    Body, Request, Response, Server,
+    Body, Request, Response,
 };
 use lazy_static::lazy_static;
 use log::info;