Fix remaining test warnings and prepare for crates.io publishing

- Updated Cargo.lock to reflect new version
- Fixed remaining warnings in resolver_test.rs
- Ensured all tests are clean from linting warnings

Author: zuub-don

Cargo.lock

@@ -75,7 +75,6 @@ async fn test_resolver_concurrency() -> anyhow::Result<()> {
 async fn test_resolver_cache() -> anyhow::Result<()> {
     // Create a temporary directory for DNS cache
     let _temp_dir = tempdir()?;
-    // We're using a temporary directory now, no need for cache_path variable
 
     // Create resolver with caching
     let resolver = DnsResolver::new_for_testing()?;