Update to code to Rust 1.67

src/tcp_relay_client/client_config.rs

@@ -93,7 +93,7 @@ fn load_pem_file(path: &Option<String>, name: &str) -> std::io::Result<Option<Ve
         None => None,
         Some(p) => Some(
             std::fs::read(p)
-                .map_err(|e| encpasulate_error(e, format!("Failed to load {}!", name)))?,
+                .map_err(|e| encpasulate_error(e, format!("Failed to load {name}!")))?,
         ),
     })
 }

src/tcp_relay_client/mod.rs

@@ -76,7 +76,7 @@ pub async fn run_app(mut args: ClientConfig) -> std::io::Result<()> {
         Err(e) => {
             Err(std::io::Error::new(
                 ErrorKind::Other,
-                format!("Failed to fetch relay configuration from server! {}", e),
+                format!("Failed to fetch relay configuration from server! {e}"),
             ))?;
             unreachable!();
         }