Update faerie, remove usage of failure (#591)

This commit removes the usage of the `failure` crate and finishes up the
final pieces of the migration to `std::error::Error` and `anyhow`. The
`faerie` crate was updated to pull in its migration from `failure` to
`anyhow` as well.

crates/debug/src/transform/attr.rs

@@ -5,7 +5,7 @@ use super::unit::PendingDieRef;
 use super::{DebugInputContext, Reader, TransformError};
 use crate::HashMap;
 use alloc::vec::Vec;
-use failure::Error;
+use anyhow::Error;
 use gimli::{
     write, AttributeValue, DebugLineOffset, DebugStr, DebuggingInformationEntry, UnitOffset,
 };