chore(deps): update dependency phoenix_ecto to v4

[renovate]

This PR contains the following updates:

Package	Update	Change
phoenix_ecto	major	== 3.6.0 -> == 4.6.3

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[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: mix deps.update phoenix_ecto
    warning: found quoted keyword "test" but the quotes are not required. Note that keywords are always atoms, even when quoted. Similar to atoms, keywords made exclusively of ASCII letters, numbers, and underscores and not beginning with a number do not require quotes
    │
 52 │      "test": ["ecto.create --quiet", "ecto.migrate", "test"]]
    │       ~
    │
    └─ mix.exs:52:7

    warning: use Mix.Config is deprecated. Use the Config module instead
    │
  6 │ use Mix.Config
    │ ~~~~~~~~~~~~~~
    │
    └─ config/config.exs:6

    warning: Mix.Config.config/2 is deprecated. Use the Config module instead
    │
  9 │ config :eblog,
    │ ~~~~~~~~~~~~~~
    │
    └─ config/config.exs:9

    warning: Mix.Config.config/3 is deprecated. Use the Config module instead
    │
 13 │ config :eblog, Eblog.Endpoint,
    │ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    │
    └─ config/config.exs:13

    warning: Mix.Config.config/3 is deprecated. Use the Config module instead
    │
 21 │ config :logger, :console,
    │ ~~~~~~~~~~~~~~~~~~~~~~~~~
    │
    └─ config/config.exs:21

    warning: Mix.Config.import_config/1 is deprecated. Use the Config module instead
    │
 27 │ import_config "#{Mix.env}.exs"
    │ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    │
    └─ config/config.exs:27

    warning: use Mix.Config is deprecated. Use the Config module instead
    │
  1 │ use Mix.Config
    │ ~~~~~~~~~~~~~~
    │
    └─ config/dev.exs:1

    warning: Mix.Config.config/3 is deprecated. Use the Config module instead
    │
  9 │ config :eblog, Eblog.Endpoint,
    │ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    │
    └─ config/dev.exs:9

    warning: Mix.Config.config/3 is deprecated. Use the Config module instead
    │
 19 │ config :eblog, Eblog.Endpoint,
    │ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    │
    └─ config/dev.exs:19

    warning: Mix.Config.config/3 is deprecated. Use the Config module instead
    │
 30 │ config :logger, :console, format: "[$level] $message\n"
    │ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    │
    └─ config/dev.exs:30

    warning: Mix.Config.config/3 is deprecated. Use the Config module instead
    │
 34 │ config :phoenix, :stacktrace_depth, 20
    │ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    │
    └─ config/dev.exs:34

    warning: Mix.Config.config/3 is deprecated. Use the Config module instead
    │
 37 │ config :eblog, Eblog.Repo,
    │ ~~~~~~~~~~~~~~~~~~~~~~~~~~
    │
    └─ config/dev.exs:37

** (Mix) Hex dependency resolution failed