Update the standard library to Rust 2024

[ehuss]

This updates the standard library to Rust 2024. This includes the following notable changes:

• Macros are updated to use new expression fragment specifiers. This PR includes a test to illustrate the changes, primarily allowing const {...} expressions now.
• Some tests show a change in MIR drop order. We do not believe this will be an observable change (see zulip discussion).

Fixes #133081