Fix new warnings

src/memory.rs

@@ -50,11 +50,11 @@ impl MemoryClient {
 }
 
 fn aligned_memory(start: u32, length: usize) -> BoxBytes {
-    if start % 4 == 0 && length % 4 == 0 {
+    if start.is_multiple_of(4) && length.is_multiple_of(4) {
         let memory = vec![0u32; length / 4].into_boxed_slice();
         return bytemuck::box_bytes_of(memory);
     }
-    if start % 2 == 0 && length % 2 == 0 {
+    if start.is_multiple_of(2) && length.is_multiple_of(2) {
         let memory = vec![0u16; length / 2].into_boxed_slice();
         return bytemuck::box_bytes_of(memory);
     }