Remove dummy let assignments (#7100)

* controllers/krate/publish: Remove dummy let

With current Rust versions this dummy assignment is apparently no longer needed.

* tests/record: Replace dummy let with `move`

With current Rust versions this dummy assignment is apparently no longer needed and we can use the `move` keyword instead.

Author: Turbo87

src/controllers/krate/publish.rs

@@ -112,7 +112,6 @@ pub async fn publish(app: AppState, req: BytesRequest) -> AppResult<Json<GoodCra
         // Create a transaction on the database, if there are no errors,
         // commit the transactions to record a new or updated crate.
         conn.transaction(|conn| {
-            let _ = &new_crate;
             let name = new_crate.name;
             let vers = &*new_crate.vers;
             let links = new_crate.links;

src/tests/record.rs

@@ -381,9 +381,7 @@ fn replay_http(
         panic!("didn't find header {:?}", (name, value));
     }
 
-    async {
-        let _ = &exchange;
-
+    async move {
         let plain_text = is_plain_text(req.headers());
         let body = to_bytes(req.into_body()).await.unwrap();
         if plain_text {