tests: Sync expected stream for Pytest' version

https://docs.pytest.org/en/7.0.x/changelog.html#breaking-changes:
> [pytest#8246](pytest-dev/pytest#8246): --version now writes version information to stdout rather than stderr.

Fixes: #995
Signed-off-by: Stanislav Levin <[email protected]>

Author: stanislavlevin

tests/test_manage_py_scan.py

@@ -118,7 +118,13 @@ def test_django_project_found_invalid_settings_version(django_testdir, monkeypat
 
     result = django_testdir.runpytest_subprocess("django_project_root", "--version", "--version")
     assert result.ret == 0
-    result.stderr.fnmatch_lines(["*This is pytest version*"])
+    if result.errlines:
+        version_out = result.stderr
+    else:
+        # Pytest 7.0+
+        version_out = result.stdout
+
+    version_out.fnmatch_lines(["*This is pytest version*"])
 
     result = django_testdir.runpytest_subprocess("django_project_root", "--help")
     assert result.ret == 0