tokio_xmpp: Replace std stuff with alloc/core stuff

tokio-xmpp/src/client/login.rs

@@ -1,12 +1,12 @@
+use alloc::borrow::Cow;
+use core::str::FromStr;
 use futures::{SinkExt, StreamExt};
 use sasl::client::mechanisms::{Anonymous, Plain, Scram};
 use sasl::client::Mechanism;
 use sasl::common::scram::{Sha1, Sha256};
 use sasl::common::Credentials;
-use std::borrow::Cow;
 use std::collections::HashSet;
 use std::io;
-use std::str::FromStr;
 use tokio::io::{AsyncBufRead, AsyncWrite};
 use xmpp_parsers::{
     jid::Jid,

tokio-xmpp/src/client/stream.rs

@@ -4,9 +4,8 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
+use core::{pin::Pin, task::Context};
 use futures::{ready, task::Poll, Stream};
-use std::pin::Pin;
-use std::task::Context;
 
 use crate::{
     client::Client,