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/postgres-protocol2/src/password/mod.rs

@@ -6,12 +6,13 @@
 //! side. This is good because it ensures the cleartext password won't
 //! end up in logs pg_stat displays, etc.
 
-use crate::authentication::sasl;
 use hmac::{Hmac, Mac};
 use rand::RngCore;
 use sha2::digest::FixedOutput;
 use sha2::{Digest, Sha256};
 
+use crate::authentication::sasl;
+
 #[cfg(test)]
 mod test;