Enable clippy::borrow_deref_ref (#8894)

This PR enables the
[`clippy::borrow_deref_ref`](https://rust-lang.github.io/rust-clippy/master/index.html#/borrow_deref_ref)
rule and fixes the outstanding violations.

Release Notes:

- N/A

crates/collab/src/db/queries/servers.rs

@@ -98,7 +98,7 @@ impl Database {
                     .add(server::Column::Environment.eq(environment))
                     .add(server::Column::Id.ne(new_server_id)),
             )
-            .all(&*tx)
+            .all(tx)
             .await?;
         Ok(stale_servers.into_iter().map(|server| server.id).collect())
     }