Upgrade excoveralls deps

[kianmeng]

mix coveralls crashed when running in Elixir 1.13 and Erlang/OTP 24.

Affected deps:

Upgraded:
  certifi 1.2.1 => 2.8.0 (major)
  excoveralls 0.7.1 => 0.14.4 (minor)
  hackney 1.8.6 => 1.18.0
  idna 5.0.2 => 6.1.1 (major)
  mimerl 1.0.2 => 1.2.0
  ssl_verify_fun 1.1.1 => 1.1.6
  unicode_util_compat 0.2.0 => 0.7.0 (minor)
New:
  jason 1.3.0
  parse_trans 3.3.1

Errors:

$ mix coveralls

Randomized with seed 259547 
** (FunctionClauseError) no function clause matching in IO.chardata_to_string/1    
                                                                                          
    The following arguments were given to IO.chardata_to_string/1:       
     
        # 1
        nil
     
    Attempted function clauses (showing 2 out of 2):
     
        def chardata_to_string(string) when is_binary(string)
        def chardata_to_string(list) when is_list(list)
     
    (elixir 1.13.0) lib/io.ex:627: IO.chardata_to_string/1
    (elixir 1.13.0) lib/path.ex:423: Path.dirname/1
    (excoveralls 0.7.1) lib/excoveralls/cover.ex:21: ExCoveralls.Cover.module_path/1
    (excoveralls 0.7.1) lib/excoveralls/stats.ex:53: ExCoveralls.Stats.add_counts/4
    (elixir 1.13.0) lib/enum.ex:2396: Enum."-reduce/3-lists^foldl/2-0-"/3
    (excoveralls 0.7.1) lib/excoveralls/stats.ex:28: ExCoveralls.Stats.report/1
    (excoveralls 0.7.1) lib/excoveralls.ex:37: ExCoveralls.execute/2
    (mix 1.13.0) lib/mix/tasks/test.ex:538: Mix.Tasks.Test.do_run/3
    (mix 1.13.0) lib/mix/task.ex:397: anonymous fn/3 in Mix.Task.run_task/3
    (excoveralls 0.7.1) lib/mix/tasks.ex:51: Mix.Tasks.Coveralls.do_run/2
    (mix 1.13.0) lib/mix/task.ex:397: anonymous fn/3 in Mix.Task.run_task/3
    (mix 1.13.0) lib/mix/cli.ex:84: Mix.CLI.run_task/2
    (elixir 1.13.0) lib/code.ex:1183: Code.require_file/2

[fredwu]

Thanks! ❤️

[kianmeng]

🎉 🎉 🎉 🎉 🎉