utils/worker.cpp: improved including + using

src/utils/worker.cpp

@@ -3,7 +3,7 @@
  * @author Martin Pulec     <[email protected]>
  */
 /*
- * Copyright (c) 2013 CESNET, z. s. p. o.
+ * Copyright (c) 2013-2024 CESNET, z. s. p. o.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -35,18 +35,20 @@
  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "utils/misc.h" // get_cpu_core_count
-#include "utils/thread.h"
-#include "utils/worker.h"
-
 #include <algorithm>
 #include <cassert>
 #include <pthread.h>
 #include <queue>
 #include <set>
 #include <vector>
 
-using namespace std;
+#include "utils/misc.h" // get_cpu_core_count
+#include "utils/thread.h"
+#include "utils/worker.h"
+
+using std::queue;
+using std::set;
+using std::vector;
 
 struct wp_worker;