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

libs/proxy/tokio-postgres2/src/statement.rs

@@ -1,15 +1,14 @@
+use std::fmt;
+use std::sync::{Arc, Weak};
+
+use postgres_protocol2::Oid;
+use postgres_protocol2::message::backend::Field;
+use postgres_protocol2::message::frontend;
+
 use crate::client::InnerClient;
 use crate::codec::FrontendMessage;
 use crate::connection::RequestMessages;
 use crate::types::Type;
-use postgres_protocol2::{
-    message::{backend::Field, frontend},
-    Oid,
-};
-use std::{
-    fmt,
-    sync::{Arc, Weak},
-};
 
 struct StatementInner {
     client: Weak<InnerClient>,