chore: more fixes to renovate.json (#248)
chore: more fixes to renovate.json (#248)

1. `"upgradeInRange": true` will ask Renovate to send PRs for updates that are covered by a range. I.e. `google-gax` dependency is currently set to `^1.12.0` and since the latest version `1.14.1` is within that range, we don't get a PR. We want the generated libraries to have the very latest dependencies listed, so we actually want to see PRs for these updates.

2. Set assignees for Renovate PRs.
googleapis/gapic-generator-typescript,googleapis/gapic-generator-typescript,googleapis/gapic-generator-typescript