fix: resolve remaining clippy warning in validation tests

Author: ozankasikci

tests/validation_tests.rs

@@ -327,7 +327,7 @@ fn test_generate_file_names_multiple() {
         pkcs12: false,
     };
 
-    let (cert, key, _) = fastcert::cert::generate_file_names(&config);
+    let (cert, _key, _) = fastcert::cert::generate_file_names(&config);
     assert!(
         cert.to_str().unwrap().contains("+"),
         "Cert file should indicate multiple hosts"