chore: Replace lazy_static Mutex with const. (#2693)

Mutex::new() is const-stable as of Rust 1.63.

Release Notes:
- N/A

crates/live_kit_client/src/test.rs

@@ -1,18 +1,15 @@
 use anyhow::{anyhow, Result};
 use async_trait::async_trait;
-use collections::HashMap;
+use collections::{BTreeMap, HashMap};
 use futures::Stream;
 use gpui::executor::Background;
-use lazy_static::lazy_static;
 use live_kit_server::token;
 use media::core_video::CVImageBuffer;
 use parking_lot::Mutex;
 use postage::watch;
 use std::{future::Future, mem, sync::Arc};
 
-lazy_static! {
-    static ref SERVERS: Mutex<HashMap<String, Arc<TestServer>>> = Default::default();
-}
+static SERVERS: Mutex<BTreeMap<String, Arc<TestServer>>> = Mutex::new(BTreeMap::new());
 
 pub struct TestServer {
     pub url: String,