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

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

Release Notes:
- N/A

crates/vim/src/test/neovim_connection.rs

@@ -11,8 +11,6 @@ use gpui::keymap_matcher::Keystroke;
 
 use language::Point;
 
-#[cfg(feature = "neovim")]
-use lazy_static::lazy_static;
 #[cfg(feature = "neovim")]
 use nvim_rs::{
     create::tokio::new_child_cmd, error::LoopError, Handler, Neovim, UiAttachOptions, Value,
@@ -32,9 +30,7 @@ use collections::VecDeque;
 // Neovim doesn't like to be started simultaneously from multiple threads. We use this lock
 // to ensure we are only constructing one neovim connection at a time.
 #[cfg(feature = "neovim")]
-lazy_static! {
-    static ref NEOVIM_LOCK: ReentrantMutex<()> = ReentrantMutex::new(());
-}
+static NEOVIM_LOCK: ReentrantMutex<()> = ReentrantMutex::new(());
 
 #[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
 pub enum NeovimData {