Code review comment for ~litios/ubuntu-cve-tracker:sync-from-usns-extract-cves

Thanks for the input, it was useful! I added your suggestions to a new commit.

Regarding CI/CD, it is failing but that's because of the check-cves job, the unit-tests is passing which is the one running the test from this PR, so it should be good but let me know if you think there is something else wrong:

============ 869 passed, 1 skipped, 32 warnings in 60.82s (0:01:00) ============