Fix warnings in Elixir 1.20 and require Elixir 1.15

[sabiwara]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build f2b9275beea68a3e5b61ecc31ee51ec4fa59e258-PR-474

Details

• 4 of 4 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 87.772%

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Totals
Change from base Build e28c85aad15d1f0cfcb1d5e4f4abada5f37f0f11:	0.0%
Covered Lines:	1292
Relevant Lines:	1472

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💛 - Coveralls

[whatyouhide]

@sabiwara tests fail consistently on 1.15. Have you tried the suite locally?

[sabiwara]

@whatyouhide sorry I only ran them on 1.19.
Will try to revert the require one for now to see if it fixes it.

[sabiwara]

Hum actually even main fails on 1.15, seems unrelated to the changes 🤔

[sabiwara]

@whatyouhide if I run the "for some reason works" fix from here (even on OTP24), it seems to fix it. No idea what it's about though and how it should actually be fixed.
I pushed f2b9275 in case we want to move forward with this for now.