feat(utils): replace the ZeroInit supertrait of BinInteger with Zeroable

`BinInteger` is not covered by stability guarantees, so this is not a
breaking change.

Author: yvt

src/r3_kernel/src/utils/int.rs

@@ -1,7 +1,7 @@
 use core::{fmt, ops};
 use num_integer::Integer;
 
-use super::{Init, ZeroInit};
+use super::{Init, Zeroable};
 
 /// Get the smallest unsigned integer type capable of representing the specified
 /// value.
@@ -31,7 +31,7 @@ pub trait BinInteger:
     + ops::DivAssign
     + fmt::Debug
     + Init
-    + ZeroInit
+    + Zeroable
     + Send
     + Sync
     + num_traits::cast::ToPrimitive