Turbopack: chore: Update anyhow, remove old backtrace feature (#85844)
- `anyhow` now causes `cargo clippy` to warn about `.to_string()` in `bail!(...)` calls. I also inlined most of these format string variables while I was at it. https://github.com/dtolnay/anyhow/pull/426
- The `backtrace` feature isn't needed (and is a no-op) since Rust 1.65. https://github.com/dtolnay/anyhow/blob/master/Cargo.toml#L19-L22