Upgrade parking_lot

See rustwasm/wasm-bindgen#2160

Author: mmsinclair

Cargo.toml

@@ -9,7 +9,7 @@ repository = "https://github.com/tomaka/wasm-timer"
 
 [dependencies]
 futures = "0.3.1"
-parking_lot = "0.11"
+parking_lot = "0.12"
 pin-utils = "0.1.0"
 
 [target.'cfg(all(target_arch = "wasm32", target_os = "unknown"))'.dependencies]