Update dependency phoenix to ~> 1.7.0

[renovate]

This PR contains the following updates:

Package	Update	Change
phoenix	minor	~> 1.5.7 -> ~> 1.7.0

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR has been generated by Mend Renovate. View repository job log here.

[renovate]

⚠ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: mix.lock

Command failed: docker run --rm --name=renovate_sidecar --label=renovate_child -v "/mnt/renovate/gh/SahneeDEV/renovate-test":"/mnt/renovate/gh/SahneeDEV/renovate-test" -v "/tmp/renovate-cache":"/tmp/renovate-cache" -v "/tmp/containerbase":"/tmp/containerbase" -e BUILDPACK_CACHE_DIR -e CONTAINERBASE_CACHE_DIR -w "/mnt/renovate/gh/SahneeDEV/renovate-test" docker.io/containerbase/sidecar bash -l -c "install-tool erlang 24.3.4.9 && install-tool elixir v1.14.3 && mix deps.update phoenix"
warning: use Mix.Config is deprecated. Use the Config module instead
  config/config.exs:1

** (File.Error) could not read file "/mnt/renovate/gh/SahneeDEV/renovate-test/config/releases.exs": no such file or directory
    (elixir 1.14.3) lib/file.ex:358: File.read!/1
    (elixir 1.14.3) lib/config.ex:273: Config.__import__!/1
    (mix 1.14.3) lib/mix/config.ex:162: anonymous fn/2 in Mix.Config.__import__!/2
    (elixir 1.14.3) lib/enum.ex:2468: Enum."-reduce/3-lists^foldl/2-0-"/3
    (mix 1.14.3) lib/mix/config.ex:161: Mix.Config.__import__!/2
    (stdlib 3.17.2.2) erl_eval.erl:685: :erl_eval.do_apply/6