chore(cargo): replace unmaintained ansi_term with nu-ansi-term

src/contact.rs

@@ -2890,7 +2890,7 @@ Hi."#;
         bob.recv_msg(&sent_msg).await;
         let contact = Contact::get_by_id(&bob, *contacts.first().unwrap()).await?;
 
-        let green = ansi_term::Color::Green.normal();
+        let green = nu_ansi_term::Color::Green.normal();
         assert!(
             contact.was_seen_recently(),
             "{}",

src/test_utils.rs

@@ -10,10 +10,10 @@ use std::path::Path;
 use std::sync::Arc;
 use std::time::{Duration, Instant};
 
-use ansi_term::Color;
 use async_channel::{self as channel, Receiver, Sender};
 use chat::ChatItem;
 use deltachat_contact_tools::{ContactAddress, EmailAddress};
+use nu_ansi_term::Color;
 use once_cell::sync::Lazy;
 use pretty_assertions::assert_eq;
 use rand::Rng;