Tests in test_helper_script.py are failing

[terriko]

We apparently forgot to enable test_helper_script.py in CI, and I enabled it as part of #1251, and it's promptly started failing:

============================== short test summary info ===============================
FAILED test/test_helper_script.py::TestHelperScript::test_parse_filename[libsndfile-1.0.25-12.el7.x86_64.rpm-libsndfile]
FAILED test/test_helper_script.py::TestHelperScript::test_parse_filename[libsndfile-1.0.31-1-aarch64.pkg.tar.xz-libsndfile]
FAILED test/test_helper_script.py::TestHelperScript::test_parse_filename[logrotate_3.14.0-4ubuntu5_amd64.deb-logrotate]
FAILED test/test_helper_script.py::TestHelperScript::test_parse_filename[libarchive_3.4.2-1_aarch64_cortex-a72.ipk-libarchive]
FAILED test/test_helper_script.py::TestHelperScript::test_parse_filename[tomcat9_9.0.37-3_all.deb-tomcat9]
FAILED test/test_helper_script.py::TestHelperScript::test_parse_filename[openssh-client_8.4p1-5ubuntu1_amd64.deb-openssh-client]
FAILED test/test_helper_script.py::TestHelperScript::test_parse_filename[./Packages/bash-4.2.46-34.el7.x86_64.rpm-bash]
==================== 9 failed, 237 passed, 222 skipped in 49.77s =====================

Pinging @peb-peb to take a look at this one! I'm temporarily disabling test_helper_script entirely in #1251 just to make sure that everything else passes, but I'd like to have it enabled soon if we can. I haven't looked into what's going wrong at all because I was busy messing with the other tests.