prefetch-npm-deps: make cargo happy

pkgs/build-support/node/fetch-npm-deps/src/cacache.rs

···
 use sha1::Sha1;
 use sha2::{Sha256, Sha512};
 use std::{
+    fmt::Write as FmtWrite,
     fs::{self, File},
     io::Write,
     path::PathBuf,
···
 
             push_hash_segments(
                 &mut p,
-                &hash
-                    .into_iter()
-                    .map(|n| format!("{n:02x}"))
-                    .collect::<String>(),
+                &hash.into_iter().fold(String::new(), |mut out, n| {
+                    let _ = write!(out, "{n:02x}");
+                    out
+                }),
             );
 
             p

pkgs/build-support/node/fetch-npm-deps/src/parse/lock.rs

···
     }
 }
 
+#[allow(clippy::incorrect_partial_ord_impl_on_ord_type)]
 impl PartialOrd for Hash {
     fn partial_cmp(&self, other: &Hash) -> Option<Ordering> {
         let lhs = self.0.split_once('-')?.0;