chore(backend): update dependency ecto to ~> 3.11.0

[plural-renovate[bot]]

This PR contains the following updates:

Package	Update	Change
ecto	minor	~> 3.9.0 -> ~> 3.11.0

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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.

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

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This PR has been generated by Renovate Bot.

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[plural-renovate[bot]]

⚠ Artifact update problem

Renovate failed to update artifacts 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: install-tool elixir v1.17.1
No /opt/containerbase/tools/elixir/1.17.1/bin defined - aborting

File name: mix.lock

Command failed: install-tool elixir v1.17.1
No /opt/containerbase/tools/elixir/1.17.1/bin defined - aborting