Remove Renovate PR concurrency limits

[robbeverhelst]

Problem

Renovate holds back dependency update PRs due to default concurrency limits. Updates sit in the Dependency Dashboard waiting instead of creating PRs immediately.

Fix

Add to renovate.json:

{
  "prConcurrentLimit": 0,
  "prHourlyLimit": 0
}

This removes all limits so every update gets a PR immediately.

[robbeverhelst]

Updating ticket: the issue is not just concurrency limits but also the schedule restricting when PRs are created.

Full fix for renovate.json:

{
  "prConcurrentLimit": 0,
  "prHourlyLimit": 0,
  "schedule": ["at any time"]
}

This ensures:

• No concurrency limits (all updates get PRs immediately)
• No hourly limits
• No schedule restrictions (PRs created as soon as Renovate detects an update)

Goal: the Dependency Dashboard should never have items "awaiting schedule." Every update becomes a PR immediately.