False message on `igniter.install` task

[leandrocp]

Describe the bug
Choosing n on the igniter.install task returns "Successfully installed" even though the task was not performed (mix.exs didn't change as expected)

❯ mix igniter.install phoenix_test
compile ✔

Update: mix.exs

     ...|
33 33   |  defp deps do
34 34   |    [
   35 + |      {:phoenix_test, "~> 0.5"},
35 36   |      {:igniter, "~> 0.5"},
36 37   |      {:phoenix, "~> 1.7.18"},
     ...|


These dependencies should be installed before continuing. Modify mix.exs and install? [y/n] n

Successfully installed:

* phoenix_test

It's a minor issue but I can take a look on this one soon