chore: update Go genproto later in day on Monday (#1129)
chore: update Go genproto later in day on Monday (#1129)

The Go genproto repo updates every day after a human reviews and merges
a PR. However, this can lead to two Renovate PRs on Monday, which is
annoying. So, I updated the Renovate config to update genproto later in
the day, hopefully _after_ the Monday genproto generation is merged.
googleapis/repo-automation-bots,googleapis/repo-automation-bots,googleapis/repo-automation-bots,googleapis/repo-automation-bots,googleapis/repo-automation-bots