Create tests that do not depend on a specific repo state

[st3fan]

Some tests look at st3fan/fenix or st3fan/android-components. Since those forks are used for development, they are not guaranteed to be stable.

So some tests that pull data from them fail:

    def test_get_recent_fenix_versions(gh):
>       assert get_recent_fenix_versions(gh.get_repo(f"st3fan/fenix")) == [83, 88]
E       assert [86, 87] == [83, 88]
E         At index 0 diff: 86 != 83
E         Use -v to get the full diff

We can update the tests, but it is better to figure out a better way with more stability.