fix clippy warnings

nomos-services/http/src/backends/axum.rs

@@ -7,7 +7,7 @@ use axum::{
     extract::Query,
     http::HeaderValue,
     routing::{get, post},
-    Extension, Router,
+    Router,
 };
 use hyper::{
     header::{CONTENT_TYPE, USER_AGENT},

nomos-services/metrics/src/types.rs

@@ -542,7 +542,7 @@ impl<'de> Deserialize<'de> for Histogram {
         // TODO: this implementation is not correct because we cannot set samples for histogram,
         // need to wait prometheus support serde.
         SerializableHistogramOpts::deserialize(deserializer).map(
-            |SerializableHistogramOpts { val, opts }| {
+            |SerializableHistogramOpts { val: _, opts }| {
                 let x = prometheus::Histogram::with_opts(opts.clone()).unwrap();
                 Self { val: x, opts }
             },