Run pyupgrade --py39-plus on all files

testing/conftest.py

@@ -1,8 +1,8 @@
 from __future__ import annotations
 
+from collections.abc import Generator
 import shutil
 from typing import Callable
-from typing import Generator
 
 import execnet
 import pytest
@@ -12,7 +12,7 @@ pytest_plugins = "pytester"
 
 
 @pytest.fixture(autouse=True)
-def _divert_atexit(monkeypatch: pytest.MonkeyPatch) -> Generator[None, None, None]:
+def _divert_atexit(monkeypatch: pytest.MonkeyPatch) -> Generator[None]:
     import atexit
 
     finalizers = []

testing/test_dsession.py

@@ -1,8 +1,8 @@
 from __future__ import annotations
 
+from collections.abc import Sequence
 from typing import Any
 from typing import cast
-from typing import Sequence
 from typing import TYPE_CHECKING
 
 import execnet

testing/test_remote.py

@@ -7,7 +7,6 @@ import sys
 from typing import Any
 from typing import Callable
 from typing import cast
-from typing import Dict
 from typing import Union
 import uuid
 
@@ -90,7 +89,7 @@ def worker(request: pytest.FixtureRequest, pytester: pytest.Pytester) -> WorkerS
 
 class TestWorkerInteractor:
     UnserializerReport = Callable[
-        [Dict[str, Any]], Union[pytest.CollectReport, pytest.TestReport]
+        [dict[str, Any]], Union[pytest.CollectReport, pytest.TestReport]
     ]
 
     @pytest.fixture