Use native endianness instead of big endian

The table is built at runtime and used locally, so the endianness will
always be the same on both sides.

crates/ecolor/src/color32.rs

@@ -104,15 +104,15 @@ impl Color32 {
                 static LOOKUP_TABLE: Lazy<[u8; 256 * 256]> = Lazy::new(|| {
                     use crate::{gamma_u8_from_linear_f32, linear_f32_from_gamma_u8};
                     core::array::from_fn(|i| {
-                        let [value, alpha] = (i as u16).to_be_bytes();
+                        let [value, alpha] = (i as u16).to_ne_bytes();
                         let value_lin = linear_f32_from_gamma_u8(value);
                         let alpha_lin = linear_f32_from_linear_u8(alpha);
                         gamma_u8_from_linear_f32(value_lin * alpha_lin)
                     })
                 });
 
                 let [r, g, b] = [r, g, b]
-                    .map(|value| LOOKUP_TABLE[usize::from(u16::from_be_bytes([value, a]))]);
+                    .map(|value| LOOKUP_TABLE[usize::from(u16::from_ne_bytes([value, a]))]);
                 Self::from_rgba_premultiplied(r, g, b, a)
             }
         }