refact: Discovery callback takes a closure and fix git dependency hash

harmony_inventory_agent/src/local_presence/discover.rs

@@ -4,7 +4,8 @@ use crate::local_presence::SERVICE_NAME;
 
 pub type DiscoveryEvent = ServiceEvent;
 
-pub fn discover_agents(timeout: Option<u64>, on_event: fn(&DiscoveryEvent)) {
+pub fn discover_agents(timeout: Option<u64>, on_event: impl Fn(DiscoveryEvent) + Send + 'static)
+{
     // Create a new mDNS daemon.
     let mdns = ServiceDaemon::new().expect("Failed to create mDNS daemon");
 
@@ -14,7 +15,7 @@ pub fn discover_agents(timeout: Option<u64>, on_event: fn(&DiscoveryEvent)) {
 
     std::thread::spawn(move || {
         while let Ok(event) = receiver.recv() {
-            on_event(&event);
+            on_event(event.clone());
             match event {
                 ServiceEvent::ServiceResolved(resolved) => {
                     println!("Resolved a new service: {}", resolved.fullname);