chore: Bump Rust edition to 2024 (#27800)

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

Release Notes:

- N/A

crates/snippet_provider/src/format.rs

@@ -1,8 +1,8 @@
 use collections::HashMap;
 use schemars::{
+    JsonSchema,
     r#gen::SchemaSettings,
     schema::{ObjectValidation, Schema, SchemaObject},
-    JsonSchema,
 };
 use serde::Deserialize;
 use serde_json_lenient::Value;

crates/snippet_provider/src/registry.rs

@@ -5,7 +5,7 @@ use collections::HashMap;
 use gpui::{App, Global, ReadGlobal, UpdateGlobal};
 use parking_lot::RwLock;
 
-use crate::{file_stem_to_key, Snippet, SnippetKind};
+use crate::{Snippet, SnippetKind, file_stem_to_key};
 
 struct GlobalSnippetRegistry(Arc<SnippetRegistry>);