tests/test_git_superproject.py::SuperprojectTestCase::test_Fetch was
failing in Python 3.6 and 3.7 due to attribute args only being
introduced in Python 3.8. Falling back on old way of accessing
the arguments.
Test: tox with Python 3.6 to 3.11
Change-Id: Iae1934a7bce8cbd6b4519e4dbc92d94e21b43435
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/382818
Tested-by: Daniel Kutik <daniel.kutik@lavawerk.com>
Reviewed-by: Mike Frysinger <vapier@google.com>
Commit-Queue: Daniel Kutik <daniel.kutik@lavawerk.com>