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/connect_socket.rs

@@ -1,11 +1,13 @@
-use crate::config::Host;
-use crate::Error;
 use std::future::Future;
 use std::io;
 use std::time::Duration;
+
 use tokio::net::{self, TcpStream};
 use tokio::time;
 
+use crate::Error;
+use crate::config::Host;
+
 pub(crate) async fn connect_socket(
     host: &Host,
     port: u16,