Remove support for python <3.11 (#1273)

Python 3.11 ships with latest Debian Bookworm. 
pypy is not that widely used with this library based on statistics. It could be added back when pypy supports python 3.11.

tests/test_feature.py

@@ -1,5 +1,4 @@
 import logging
-import sys
 from unittest.mock import AsyncMock, patch
 
 import pytest
@@ -14,7 +13,7 @@ class DummyDevice:
     pass
 
 
-@pytest.fixture()
+@pytest.fixture
 def dummy_feature() -> Feature:
     # create_autospec for device slows tests way too much, so we use a dummy here
 
@@ -159,10 +158,6 @@ async def test_precision_hint(dummy_feature, precision_hint):
     assert f"{round(dummy_value, precision_hint)} dummyunit" in repr(dummy_feature)
 
 
-@pytest.mark.skipif(
-    sys.version_info < (3, 11),
-    reason="exceptiongroup requires python3.11+",
-)
 async def test_feature_setters(dev: Device, mocker: MockerFixture):
     """Test that all feature setters query something."""