fix triple buffer no_std compatibility

Author: BillyDM

crates/firewheel-nodes/src/triple_buffer.rs

@@ -13,6 +13,8 @@ use firewheel_core::{
 
 #[cfg(not(feature = "std"))]
 use bevy_platform::prelude::Vec;
+#[cfg(not(feature = "std"))]
+use num_traits::Float;
 
 /// The configuration of a [`TripleBufferNode`]
 #[derive(Debug, Clone, Copy, PartialEq)]