feat: Expand serde deserialize impl

[Techassi]

Fixes #1338

The config now supports a list of integers and a single integer as the accept value.

[Techassi]

Seems like the lychee::cli::test_suggests_url_alternatives test is flaky again.

[mre]

Awesome PR. Lifesaver!

Yup, sorry about that. That happens when archive.org takes too long to send a response. We have exponential back off in place, but it might be better to disable the test altogether. 😕
I re-ran it and now the error seems to be relevant to the changes. Can you take a look?

[Techassi]

I re-ran it and now the error seems to be relevant to the changes. Can you take a look?

Yes, will do.

[Techassi]

The test ran fine multiple times on my local machine. The description states that it is flaky:

Unfortunately, LinkedIn does not always return 999, so this is a flaky test. We only check that the cache file doesn't contain any invalid status codes.

[mre]

LinkedIn never fails to deliver. 😆 Merging. Thanks for the quick fix!🥇

[Techassi]

LinkedIn never fails to deliver.

Lol!