Fix broken urls
With this MR, only two tests are failing with OSINFO_DB_NETWORK_TESTS=1 make check
== short test summary info
FAILED tests/test_urls.py::test_urls[guix-hurd-latest] - AssertionError: assert ['https://ci....ebones.qcow2'] == []
FAILED tests/test_urls.py::test_urls[guix-latest] - AssertionError: assert ['https://ci....ux+image.iso'] == []
== 2 failed, 6420 passed in 646.68s (0:10:46)