chore(deps): update dependency guardian_db to v3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
guardian_db (source)	prod	major	~> 2.0 → ~> 3.0

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Release Notes

ueberauth/guardian_db (guardian_db)

v3.0.0

• Introduced Guardian.DB.Adapter behaviour to allow for custom database adapters to be used with Guardian DB.
  • Add config :guardian, Guardian.DB, adapter: Guardian.DB.EctoAdapter to fall back to the default Ecto adapter.
  • Added Guardian.DB.ETSAdapter.
  • Added Guardian.DB.EctoAdapter.
• Allow migrations mix task with custom table name.
• Make jti and aud required fields, since they are primary keys.

Breaking changes

• Guardian.DB.Token.SweeperServer becomes Guardian.DB.Sweeper
• sweep_interval option is no longer supported. Specify interval directly instead.
• Sweep intervals are now specified in milliseconds instead of minutes.

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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.

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• any of the package files in this branch needs updating, or
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The artifact failure details are included below:

File name: mix.lock

Command failed: install-tool elixir v1.19.5

[sentry]

Bug: The application references Guardian.DB.Token.SweeperServer, which was renamed to Guardian.DB.Sweeper in Guardian.DB v3.0, causing a startup failure.
_{Severity: CRITICAL}

Suggested Fix

In lib/cadet/application.ex, update the worker from Guardian.DB.Token.SweeperServer to Guardian.DB.Sweeper to use the correct module name for the new version.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent.
Verify if this is a real issue. If it is, propose a fix; if not, explain why it's not
valid.

Location: mix.exs#L73

Potential issue: The application's worker list references
`Guardian.DB.Token.SweeperServer`. Following the upgrade to Guardian.DB v3.0, this
module has been renamed to `Guardian.DB.Sweeper`. This incorrect module reference will
cause the application to fail during initialization because the specified module no
longer exists, preventing the application from starting.