chore(renovate): enable lockfileMaintenance for examples/**

[MikeMcC399]

Situation

Renovate is currently not configured in renovate.json for lockfileMaintenance since this could cause the need for an action rebuild, and so far there hasn't been a process set up that could deal with this.

This means however that vulnerabilities in the examples sub-directories caused by transient dependencies such as lodash are currently not addressed by Renovate updates.

Change

Enable lockFileMaintenance in the renovate.json configuration for examples/** only.

lockFileMaintenance runs weekly by default. It can also be intiated manually through the Dependency Dashboard or through the Renovate Web UI.

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Note

Low Risk
Low risk: only updates Renovate configuration to control when lockfile maintenance PRs are created, without touching runtime code.

Overview
Enables Renovate lockFileMaintenance, then adds package rules to disable lockfile maintenance by default and re-enable it only for examples/** so Renovate can refresh example lockfiles without triggering lockfile maintenance across the rest of the repo.

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