chore(deps): update 84codes/crystal docker tag to v1.15.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
84codes/crystal	stage	minor	1.14.1-debian-bookworm -> 1.15.0-debian-bookworm

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[waghanza]

cc @@shootingfly

[shootingfly]

okay, I will update it last week.

[shootingfly]

@waghanza Because I defined a class named Index in Runcobo, it conflicts with the code in Crystal Standard Library. It is a bug for Crystal Lang.

class Index < BaseAction
  get "/"

  call do
    render_plain ""
  end
end

Code in src/crystal/event_loop/polling.cr

protected abstract def system_add(fd : Int32, index : Index) : Nil

I think it should be

protected abstract def system_add(fd : Int32, index : Arena::Index) : Nil

I will update server.cr and create an issue for Crysal Lang.

[waghanza]

Could you then ping an accurate contributor, and open an issue on their side ?

I'll, in the meantime, use the current crystal version for runcobo

[shootingfly]

I fix it in PR #8156