Use `line` for comments helper because `position` is deprecated

[dokimyj]

Hi,

Octokit has a new release on Oct 2023, including 'Use line instead of position.

Not 100% sure if the replacement of position with line is the factor, but saddler-report-github gem frequently fails posting the comments on the right line of the diff since.

I evaded the posting failure by using line number instead of patched position integer.

https://github.com/packsaddle/ruby-saddler-reporter-github/blob/master/lib/saddler/reporter/github/helper.rb#L50
(I used line_no instead on local bundle and posting comment on the correct line designated has been succeeded.)

Hope this gem is still maintained, but if EOL'd already, please let me know so I can find another way to evade the failure right away...