Reapply "chore: fix potential deadlock"

This reverts commit 6116e8c.

util/config/handler.go

@@ -56,16 +56,18 @@ func (cp *handler[T]) Add(dev Device[T]) error {
 
 // Delete deletes device
 func (cp *handler[T]) Delete(name string) error {
-	cp.mu.RLock()
-	defer cp.mu.RUnlock()
+	cp.mu.Lock()
 
 	for i, dev := range cp.devices {
 		if name == dev.Config().Name {
 			cp.devices = append(cp.devices[:i], cp.devices[i+1:]...)
+			cp.mu.Unlock()
+
 			bus.Publish(cp.topic, OpDelete, dev)
 			return nil
 		}
 	}
+	cp.mu.Unlock()
 
 	return fmt.Errorf("not found: %s", name)
 }