chore: make clippy happy (#8068)

crates/net/downloaders/src/bodies/bodies.rs

@@ -68,7 +68,7 @@ where
     Provider: HeaderProvider + Unpin + 'static,
 {
     /// Returns the next contiguous request.
-    fn next_headers_request(&mut self) -> DownloadResult<Option<Vec<SealedHeader>>> {
+    fn next_headers_request(&self) -> DownloadResult<Option<Vec<SealedHeader>>> {
         let start_at = match self.in_progress_queue.last_requested_block_number {
             Some(num) => num + 1,
             None => *self.download_range.start(),

crates/net/downloaders/src/file_client.rs

@@ -224,7 +224,7 @@ impl FileClient {
     }
 
     /// Returns an iterator over headers in the client.
-    pub fn headers_iter(&mut self) -> impl Iterator<Item = &Header> {
+    pub fn headers_iter(&self) -> impl Iterator<Item = &Header> {
         self.headers.values()
     }
 

crates/net/downloaders/src/headers/reverse_headers.rs

@@ -536,7 +536,7 @@ where
     /// Handles the error of a bad response
     ///
     /// This will re-submit the request.
-    fn on_headers_error(&mut self, err: Box<HeadersResponseError>) {
+    fn on_headers_error(&self, err: Box<HeadersResponseError>) {
         let HeadersResponseError { request, peer_id, error } = *err;
 
         self.penalize_peer(peer_id, &error);
@@ -581,7 +581,7 @@ where
     }
 
     /// Starts a request future
-    fn submit_request(&mut self, request: HeadersRequest, priority: Priority) {
+    fn submit_request(&self, request: HeadersRequest, priority: Priority) {
         trace!(target: "downloaders::headers", ?request, "Submitting headers request");
         self.in_progress_queue.push(self.request_fut(request, priority));
         self.metrics.in_flight_requests.increment(1.);