chore: remove unnecessary nightly feature

`maybe_uninit_uninit_array` isn't needed anymore, since it's directly
replaceable with an inline const expression.

Author: tehmatt

msgpacker/src/lib.rs

@@ -1,9 +1,5 @@
 #![cfg_attr(not(feature = "std"), no_std)]
-#![feature(
-    iter_array_chunks,
-    maybe_uninit_array_assume_init,
-    maybe_uninit_uninit_array
-)]
+#![feature(iter_array_chunks, maybe_uninit_array_assume_init)]
 #![warn(missing_docs)]
 #![doc = include_str!("../README.md")]
 

msgpacker/src/unpack/common.rs

@@ -97,7 +97,7 @@ macro_rules! array {
             type Error = <X as Unpackable>::Error;
 
             fn unpack(mut buf: &[u8]) -> Result<(usize, Self), Self::Error> {
-                let mut array = MaybeUninit::uninit_array();
+                let mut array = [const { MaybeUninit::uninit() }; $n];
                 let n =
                     array
                         .iter_mut()
@@ -117,7 +117,7 @@ macro_rules! array {
                 I: IntoIterator<Item = u8>,
             {
                 let mut bytes = bytes.into_iter();
-                let mut array = MaybeUninit::uninit_array();
+                let mut array = [const { MaybeUninit::uninit() }; $n];
                 let n =
                     array
                         .iter_mut()