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

[plural-renovate]

This PR contains the following updates:

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

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Configuration

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[plural-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: install-tool elixir v1.17.2
No /opt/containerbase/tools/elixir/1.17.2/bin defined - aborting