chore: fix some clippy warnings in tests

lib/tests/common.rs

@@ -1,5 +1,6 @@
 const GUAC_URL: &str = "http://localhost:8085/query";
 
+#[no_mangle]
 pub fn guac_url() -> String {
     std::env::var("GUAC_URL").unwrap_or_else(|_| GUAC_URL.to_string())
 }

lib/tests/path.rs

@@ -234,7 +234,7 @@ async fn transitive_dependents() -> Result<(), anyhow::Error> {
 
     for path in paths {
         for segment in path {
-            print!("{} ", segment.to_string());
+            print!("{} ", segment);
         }
         println!()
     }
@@ -245,7 +245,7 @@ async fn transitive_dependents() -> Result<(), anyhow::Error> {
         .await?;
 
     for dependent in dependents {
-        println!("{}", dependent.to_string())
+        println!("{}", dependent)
     }
 
     Ok(())
@@ -335,7 +335,7 @@ async fn transitive_affected() -> Result<(), anyhow::Error> {
 
     for path in paths {
         for segment in path {
-            print!("{} ", segment.to_string());
+            print!("{} ", segment);
         }
         println!()
     }
@@ -346,7 +346,7 @@ async fn transitive_affected() -> Result<(), anyhow::Error> {
         .await?;
 
     for affected in affected {
-        println!("{}", affected.to_string())
+        println!("{}", affected)
     }
 
     Ok(())

lib/tests/spog.rs

@@ -8,7 +8,7 @@ use guac::client::GuacClient;
 #[ignore]
 #[tokio::test]
 async fn product_by_cve() -> Result<(), anyhow::Error> {
-    let client = GuacClient::new(&"http://localhost:8085/query");
+    let client = GuacClient::new("http://localhost:8085/query");
 
     let result = client.semantic().product_by_cve("cve-2022-2284").await?;
     println!("result {:?}", result);
@@ -22,7 +22,7 @@ async fn product_by_cve() -> Result<(), anyhow::Error> {
 #[ignore]
 #[tokio::test]
 async fn find_vulnerability() -> Result<(), anyhow::Error> {
-    let client = GuacClient::new(&"http://localhost:8085/query");
+    let client = GuacClient::new("http://localhost:8085/query");
 
     let result = client
         .semantic()
@@ -39,7 +39,7 @@ async fn find_vulnerability() -> Result<(), anyhow::Error> {
 #[ignore]
 #[tokio::test]
 async fn find_vulnerability_by_sbom_uri() -> Result<(), anyhow::Error> {
-    let client = GuacClient::new(&"http://localhost:8085/query");
+    let client = GuacClient::new("http://localhost:8085/query");
 
     let result = client
         .semantic()
@@ -55,7 +55,7 @@ async fn find_vulnerability_by_sbom_uri() -> Result<(), anyhow::Error> {
 #[ignore]
 #[tokio::test]
 async fn find_dependent_product() -> Result<(), anyhow::Error> {
-    let client = GuacClient::new(&"http://localhost:8085/query");
+    let client = GuacClient::new("http://localhost:8085/query");
 
     let result = client
         .semantic()