Dialyzer and erlang 26.0.2 elixir 1.15.6

[visciang]

This PR address the following points

• Running on elixir 1.15.6 and erlang 26.0.2, mix dialyzer results in the following error:

  Generated optimus app
  Finding suitable PLTs
  Checking PLT...
  [:dialyxir, :elixir, :ex_doc, :kernel, :logger, :ssl, :stdlib]
  Looking up modules in dialyxir_erlang-26.0.2_elixir-1.15.6_deps-dev.plt
  ** (UndefinedFunctionError) function :dialyzer_plt.plt_kind/1 is undefined (module :dialyzer_plt is not available)
      (dialyzer 5.1) :dialyzer_plt.plt_kind(~c"/Volumes/Code/personal/optimus_savonarola/_build/dev/dialyxir_erlang-26.0.2_elixir-1.15.6_deps-dev.plt")
      (dialyzer 5.1) dialyzer.erl:294: :dialyzer.plt_info/1
      (dialyxir 1.3.0) lib/dialyxir/plt.ex:243: Dialyxir.Plt.plt_files/1
      (dialyxir 1.3.0) lib/dialyxir/plt.ex:16: Dialyxir.Plt.find_plts/3
      (dialyxir 1.3.0) lib/mix/tasks/dialyzer.ex:254: Mix.Tasks.Dialyzer.check_plt/1
      (dialyxir 1.3.0) lib/mix/tasks/dialyzer.ex:174: Mix.Tasks.Dialyzer.run/1
      (mix 1.15.6) lib/mix/task.ex:447: anonymous fn/3 in Mix.Task.run_task/5
      (mix 1.15.6) lib/mix/cli.ex:92: Mix.CLI.run_task/2
  

• The type Optimus.t() is defined as opaque but actually it is used by other Optimus modules as a non opaque type. This is detected by dialyzer application side, for example:

  optimus = Optimus.new!(...)
  
  Optimus.help(optimus)  #  <--
  Optimus.fetch_subcommand(optimus, subcommand_path)  #  <--
  

  results in

  lib/dake/cli_args.ex:104:call_with_opaque
  The call Optimus.help(_optimus@1::'Elixir.Optimus':t()) contains an opaque term in 1st argument when a structured term of 
  type atom() | #{'name':=_, _=>_} is expected}.
  ________________________________________________________________________________
  lib/dake/cli_args.ex:107:call_with_opaque
  The call Optimus.fetch_subcommand(_optimus@1::'Elixir.Optimus':t(),_subcommand_path@1::[atom(),...]) contains an 
  opaque term in 1st argument when terms of different types are expected in these positions}.
  ________________________________________________________________________________
  

[coveralls]

coverage: 90.72%. remained the same
when pulling 6b271bb on visciang:master
into 411646b on savonarola:master.

[QMalcolm]

I would like to further move to erlang 27.1.2 and elixir 1.17.3. Has there been any movement on this?