Update ciphersuite/dkg MSRVs

crypto/ciphersuite/src/lib.rs

@@ -3,8 +3,11 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 
 use core::fmt::Debug;
-#[cfg(any(feature = "alloc", feature = "std"))]
-use std_shims::io::{self, Read};
+#[allow(unused_imports)]
+use std_shims::{
+  prelude::*,
+  io::{self, Read},
+};
 
 use rand_core::{RngCore, CryptoRng};