Support pytest 9

pytest 9 has included support for subtests, marking pytest_subtests as
unmaintained at the same time -- attempt to import from pytest first,
falling back to pytest_subtests if required.

Author: s-t-e-v-e-n-k

tests/functional/shell/test_script_subprocess.py

@@ -8,7 +8,10 @@
 from typing import cast
 
 import pytest
-from pytest_subtests import SubTests
+try:
+    from pytest import Subtests as SubTests
+except ImportError:
+    from pytest_subtests import SubTests
 
 from pytestshellutils.customtypes import EnvironDict
 from pytestshellutils.exceptions import FactoryTimeout

tests/unit/utils/processes/test_processresult.py

@@ -8,7 +8,10 @@
 import textwrap
 
 import pytest
-from pytest_subtests import SubTests
+try:
+    from pytest import Subtests as SubTests
+except ImportError:
+    from pytest_subtests import SubTests
 
 from pytestshellutils.utils.processes import ProcessResult