Drop unused strip_bom import in npm crawler

This PR moved the crawler's .yarnrc reads into classic_rc, and main
dropped the import's other use, so the merged tree failed clippy's
unused-import check in the merge queue.

Refs #1901

Assisted-by: Claude Code:claude-opus-5-5

Author: claude

crates/socket-patch-core/src/crawlers/npm_crawler.rs

@@ -8,7 +8,6 @@ use serde::Deserialize;
 use super::pnpm_layout::MODULES_YAML as PNPM_MODULES_YAML;
 use super::types::{CrawledPackage, CrawlerOptions};
 use super::walk_pool::{par_map, run_walk};
-use crate::formats::text::strip_bom;
 use crate::formats::yarn::classic_rc;
 use crate::patch::path_safety;
 use crate::utils::fs::{is_dir, is_dir_sync, read_dir_entries_sync};