Update Ecto.Repo calls to work with Ecto 3.8

[edgurgel]

Hi there! Thanks for maintaining this great library.

While trying to use ExAudit with Ecto 3.8 I noticed that it wasn't working as intended so I had to do the changes I'm submitting as part of this PR.

Options are now a tuple with adapter metadata instead of just the repo options. I think it was first introduced here: https://github.com/elixir-ecto/ecto/commit/0cf1800056fb30a4fdef7277fe6d27cac8567770

Let me know if I should change it to do something else. Cheers!

[tuomohopia]

@narrowtux Any progress getting this reviewed and merged? ex_audit isn't compatible with newer Ecto versions til this gets released.

[atavistock]

@narrowtux Is this project still maintained?

[ambuznego]

@narrowtux Can you check this out when you get a chance? I would love to be able to use this library. 🙏

[bumbus]

@narrowtux Can you check this out when you get a chance? I would love to be able to use this library. 🙏

This would be great, it fixes my issue 👯 https://github.com/ZennerIoT/ex_audit/issues/93

[rohfosho]

@narrowtux Any updates on this? Is this library still maintained?

[edgurgel]

Thanks, @narrowtux !