Update to Elixir 1.17

[jiegillet]

This time I beat you to it @angelikatyborska :)

Quite a few code changes, a bunch of warnings for descending ranges (10..1 should now be 10..1//-1) and a few more specific ones that I will comment on.

What do you think about the mix files

  def project do
    [
      app: :ledger,
      version: "0.1.0",
      # elixir: "~> 1.10",
      start_permanent: Mix.env() == :prod,
      deps: deps()
    ]
  end

should we bother updating the comment to 1.12?

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[jiegillet]

Yay! Thanks for the review :) One link is dead but we can fix that some other time