Fix test for python 3.10

tests/devices/test_block.py

@@ -1,3 +1,5 @@
+import asyncio
+import sys
 from unittest.mock import MagicMock, patch
 
 import pytest
@@ -7,6 +9,12 @@
 MOCK_PREFIX = "UNITTEST:MOCK:"
 
 
+if sys.version_info <= (3, 10):
+    aio_timeout_error = asyncio.exceptions.TimeoutError
+else:
+    aio_timeout_error = TimeoutError
+
+
 @pytest.fixture
 async def simple_block() -> BlockRwRbv[float]:
     block = BlockRwRbv(float, MOCK_PREFIX, "float_block")
@@ -77,7 +85,7 @@ async def test_block_set_with_timeout():
 
     set_mock_value(block.readback, 10)
 
-    with pytest.raises(TimeoutError):
+    with pytest.raises(aio_timeout_error):
         await block.set(20)
 
     func.assert_called_once_with(20, 10)