chore: Bump Rust edition to 2024 (#27800)

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

Release Notes:

- N/A

crates/semantic_index/src/semantic_index.rs

@@ -269,7 +269,7 @@ mod tests {
     use embedding_index::{ChunkedFile, EmbeddingIndex};
     use feature_flags::FeatureFlagAppExt;
     use fs::FakeFs;
-    use futures::{future::BoxFuture, FutureExt};
+    use futures::{FutureExt, future::BoxFuture};
     use gpui::TestAppContext;
     use indexing::IndexingEntrySet;
     use language::language_settings::AllLanguageSettings;