Update Rust crate quick-xml to 0.37.0

Cargo.toml

@@ -18,3 +18,4 @@ anyhow = { version = "1.0.86", features = ["backtrace"] }
 audio = { git = "https://gavania.de/hodasemi/audio.git", optional = true }
 
 [features]
+default = ["audio"]

src/context_interface.rs

@@ -18,7 +18,7 @@ pub trait ContextInterface: Send + Sync {
     fn height(&self) -> u32;
 
     #[cfg(feature = "audio")]
-    fn sound_handler(&mut self) -> &mut SoundHandler;
+    fn sound_handler(&self) -> std::sync::MutexGuard<'_, SoundHandler>;
 }
 
 pub enum TargetMode<T> {