chore: Prepare for Rust edition bump to 2024 (without autofix) (#27791)

Successor to #27779 - in this PR I've applied changes manually, without
futzing with if let lifetimes at all.

Release Notes:

- N/A

crates/repl/src/kernels/mod.rs

@@ -79,7 +79,7 @@ pub fn python_env_kernel_specifications(
     project: &Entity<Project>,
     worktree_id: WorktreeId,
     cx: &mut App,
-) -> impl Future<Output = Result<Vec<KernelSpecification>>> {
+) -> impl Future<Output = Result<Vec<KernelSpecification>>> + use<> {
     let python_language = LanguageName::new("Python");
     let toolchains = project.read(cx).available_toolchains(
         ProjectPath {