fix build and clippy warnings

Author: syphar

src/build_queue.rs

@@ -3,7 +3,7 @@ use crate::docbuilder::PackageKind;
 use crate::error::Result;
 use crate::utils::{get_crate_priority, report_error};
 use crate::{Config, Index, Metrics, RustwideBuilder};
-use anyhow::{anyhow, Context};
+use anyhow::Context;
 
 use crates_index_diff::ChangeKind;
 use log::debug;

src/web/mod.rs

@@ -3,7 +3,7 @@
 pub(crate) mod page;
 
 use crate::utils::report_error;
-use anyhow::{anyhow, Context};
+use anyhow::{anyhow, Context as _};
 use log::info;
 use serde_json::Value;