Update all Elixir Exercism repos to use Elixir 1.15 and OTP 26 about elixir HOT 8 CLOSED

@angelikatyborska I was just peeking into this when I noticed you assigned this ha!

At first glance some minor changes to mix.exs and an upgrade to dialyxer.

I'm running into an issue with the TakeANumberDeluxe test (🤔 didn't we just fix an issue on that one?) where the GenServer is exiting on invalid configuration. Just going over that at the moment

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Ah, sorry 😅 I opened a draft PR #1332 - draft because I don't know yet how to handle that failing TakeANumberDeluxe test. Let me know if you figure it out!

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All good! I'll dig it out and then move over to your PR discussion

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@dabaer If you're interested in helping out further, now that #1332 is merged, you could open PRs for the 3 other repositories

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Will do 🎉

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♥️💙💚💛💜

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It's live and I wrote a little site update:

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It was a wild ride with breaking changes, and certainly one of the largest PR threads I've ever seen.

Thank you and @neenjaw for your guidance on these commits, it's really expanded my knowledge of Elixir!

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