Upgrade proxy crates to edition 2024 (#10942)

This upgrades the `proxy/` crate as well as the forked libraries in
`libs/proxy/` to edition 2024.

Also reformats the imports of those forked libraries via:

```
cargo +nightly fmt -p proxy -p postgres-protocol2 -p postgres-types2 -p tokio-postgres2 -- -l --config imports_granularity=Module,group_imports=StdExternalCrate,reorder_imports=true
```

It can be read commit-by-commit: the first commit has no formatting
changes, only changes to accomodate the new edition.

Part of #10918

proxy/src/redis/elasticache.rs

@@ -1,6 +1,7 @@
 use std::sync::Arc;
 use std::time::{Duration, SystemTime};
 
+use aws_config::Region;
 use aws_config::environment::EnvironmentVariableCredentialsProvider;
 use aws_config::imds::credentials::ImdsCredentialsProvider;
 use aws_config::meta::credentials::CredentialsProviderChain;
@@ -8,7 +9,6 @@ use aws_config::meta::region::RegionProviderChain;
 use aws_config::profile::ProfileFileCredentialsProvider;
 use aws_config::provider_config::ProviderConfig;
 use aws_config::web_identity_token::WebIdentityTokenCredentialsProvider;
-use aws_config::Region;
 use aws_sdk_iam::config::ProvideCredentials;
 use aws_sigv4::http_request::{
     self, SignableBody, SignableRequest, SignatureLocation, SigningSettings,

proxy/src/redis/keys.rs

@@ -1,7 +1,7 @@
 use std::io::ErrorKind;
 
 use anyhow::Ok;
-use pq_proto::{id_to_cancel_key, CancelKeyData};
+use pq_proto::{CancelKeyData, id_to_cancel_key};
 use serde::{Deserialize, Serialize};
 
 pub mod keyspace {