fix: factory, not type [threading.Lock]

Signed-off-by: Damian Skrzyński <polprog.tech@gmail.com>

Author: polprog-dev

tests/unit/test_infrastructure_persistence.py

@@ -209,13 +209,13 @@ class TestSSLContextThreadSafety:
 
     def test_lock_exists(self):
         """GIVEN the network module is imported"""
-        import threading
-
         from appsecone.shared import network
 
-        """THEN _context_lock is a threading.Lock instance"""
+        """THEN _context_lock is a lock with acquire/release"""
         assert hasattr(network, "_context_lock")
-        assert isinstance(network._context_lock, threading.Lock)
+        lock = network._context_lock
+        assert callable(getattr(lock, "acquire", None))
+        assert callable(getattr(lock, "release", None))
 
 class TestStructuredErrorPages:
     """Error pages include navigation and status code."""