iotests: Change imports for Python 3.13

Python 3.13 isn't out yet, but it's in beta and Fedora is ramping up to
make it the default system interpreter for Fedora 41.

They moved our cheese for where ContextManager lives; add a conditional
to locate it while we support both pre-3.9 and 3.13+.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 20240626232230.408004-4-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>

tests/qemu-iotests/testenv.py

@@ -25,7 +25,12 @@ import collections
 import random
 import subprocess
 import glob
-from typing import List, Dict, Any, Optional, ContextManager
+from typing import List, Dict, Any, Optional
+
+if sys.version_info >= (3, 9):
+    from contextlib import AbstractContextManager as ContextManager
+else:
+    from typing import ContextManager
 
 DEF_GDB_OPTIONS = 'localhost:12345'
 

tests/qemu-iotests/testrunner.py

@@ -27,11 +27,14 @@ import json
 import shutil
 import sys
 from multiprocessing import Pool
-from typing import List, Optional, Any, Sequence, Dict, \
+from typing import List, Optional, Any, Sequence, Dict
-        ContextManager
-
 from testenv import TestEnv
 
+if sys.version_info >= (3, 9):
+    from contextlib import AbstractContextManager as ContextManager
+else:
+    from typing import ContextManager
+
 
 def silent_unlink(path: Path) -> None:
     try: