refactor(opc): Rename async close method to aclose

Renamed the OPC.close asynchronous method to OPC.aclose to align with common Python conventions for asynchronous context managers and methods, improving clarity. All call sites and tests have been updated accordingly.

tests/laborious/activities/test_opc.py

@@ -734,5 +734,5 @@ async def test_validate_server(opc):
 @mark.asyncio
 async def test_close(opc):
     opc.opc_repository['server1'].disconnect = AsyncMock(return_value=True)
-    await opc.close()
+    await opc.aclose()
     opc.opc_repository['server1'].disconnect.assert_called_once()