chore: Bump Rust edition to 2024 (#27800)

Follow-up to https://github.com/zed-industries/zed/pull/27791

Release Notes:

- N/A

crates/buffer_diff/src/buffer_diff.rs

@@ -1296,7 +1296,7 @@ mod tests {
     use super::*;
     use gpui::TestAppContext;
     use pretty_assertions::{assert_eq, assert_ne};
-    use rand::{rngs::StdRng, Rng as _};
+    use rand::{Rng as _, rngs::StdRng};
     use text::{Buffer, BufferId, Rope};
     use unindent::Unindent as _;
     use util::test::marked_text_ranges;