fix nightly 1.75 (neondatabase#5719)

## Problem

Neon doesn't compile on nightly and had numerous clippy complaints.

## Summary of changes

1. Fixed troublesome dependency
2. Fixed or ignored the lints where appropriate

libs/postgres_ffi/wal_craft/src/lib.rs

@@ -14,6 +14,7 @@ macro_rules! xlog_utils_test {
     ($version:ident) => {
         #[path = "."]
         mod $version {
+            #[allow(unused_imports)]
             pub use postgres_ffi::$version::wal_craft_test_export::*;
             #[allow(clippy::duplicate_mod)]
             #[cfg(test)]

pageserver/src/tenant/timeline/walreceiver/walreceiver_connection.rs

@@ -459,7 +459,7 @@ async fn identify_system(client: &Client) -> anyhow::Result<IdentifySystem> {
 
     // extract the row contents into an IdentifySystem struct.
     // written as a closure so I can use ? for Option here.
-    if let Some(SimpleQueryMessage::Row(first_row)) = response.get(0) {
+    if let Some(SimpleQueryMessage::Row(first_row)) = response.first() {
         Ok(IdentifySystem {
             systemid: get_parse(first_row, 0)?,
             timeline: get_parse(first_row, 1)?,

proxy/src/console/provider/mock.rs

@@ -59,7 +59,7 @@ impl Api {
             let rows = client.query(query, &[&creds.user]).await?;
 
             // We can get at most one row, because `rolname` is unique.
-            let row = match rows.get(0) {
+            let row = match rows.first() {
                 Some(row) => row,
                 // This means that the user doesn't exist, so there can be no secret.
                 // However, this is still a *valid* outcome which is very similar

proxy/src/scram.rs

@@ -18,7 +18,6 @@ mod password;
 pub use exchange::Exchange;
 pub use key::ScramKey;
 pub use secret::ServerSecret;
-pub use secret::*;
 
 use hmac::{Hmac, Mac};
 use sha2::{Digest, Sha256};