chore: update renovate config (#4353)
chore: update renovate config (#4353)

* chore: update renovate config

There are two changes in this PR

* Separate PRs for each bots by `additionalBranchPrefix`
* Combine PRs for major and minor updates into one

I think this is close to what our script does today.

* deps: bundle octokit deps

* chore: change the order

* deps: make groups exclusive to each other

* chore: fix json

* deps: enable dashboard, add stabilityDays
googleapis/repo-automation-bots,googleapis/repo-automation-bots,googleapis/repo-automation-bots,googleapis/repo-automation-bots,googleapis/repo-automation-bots