Elixir tests

fix: always monitor the manager #402

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2 errors and 6 warnings

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System.stacktrace/0 is deprecated. Use __STACKTRACE__ instead

Mix.Config.merge/2 is deprecated. Use Config.Reader.merge/2 instead

System.stacktrace/0 is deprecated. Use __STACKTRACE__ instead

Mix.Config.eval!/2 is deprecated. Use Config.Reader.read_imports!/2 instead

Mix.Config.merge/2 is deprecated. Use Config.Reader.merge/2 instead

Mix.Config.persist/1 is deprecated. Use Application.put_all_env/2 instead