Use nu-ansi-term instead of ansi_term

The `nu-ansi-term` crate is a fork of `ansi_term` which is maintained by
the Nushell project.

Cargo.toml

@@ -42,7 +42,7 @@ regex-fancy = ["syntect/regex-fancy"] # Use the rust-only "fancy-regex" engine
 
 [dependencies]
 atty = { version = "0.2.14", optional = true }
-ansi_term = "^0.12.1"
+nu-ansi-term = "0.47.0"
 ansi_colours = "^1.2"
 bincode = "1.0"
 console = "0.15.5"