Enable renovate dependencies update

[dimaMachina]

Why

1. to make sure dependencies are always up to date
2. to avoid PR dependencies noise we can configure to schedule deps PRs only in weekend https://github.com/shuding/nextra/blob/6916d4f30a765d061075cfa4ab552eba5ddd4873/renovate.json5#L4

[printerscanner]

I think this is a great idea.