Fix removal of `.git` suffix.
    
    The intention is to remove the `.git` that may be added to, e.g., GitHub
    repository URLs. If there's a `/v2` or similar after, then we want to
    match a slash with the suffix. If the suffix is at the end, then the
    earlier code would have appended a slash _anyway_, and so we still want
    to match a slash.
    
    Allowing `.git` without slash incorrectly catches things like the middle
    of `code.gitea.com`.