Spread out the days dependabot PRs are generated

[afs]

Change

The dependbot is set to weekly for both maven and javascript.
https://github.com/apache/jena/blob/main/.github/dependabot.yml

In practice, it runs Monday early morning (around midnight - 1am UTC) presumably because things are quieter then.

It can make for a bit of a tidal wave on Monday morning.

Proposal: javascript on Sunday, maven on Tuesday.

There are other things we could try:

• group by "minor" not "patch". However, if one of a group causes a problem it is more work to split these up - specially javascript because dependabot also updates yarn.lock as well as package.json.
• Have an action to run PR builds. However, this may also affect forks - and it's charged to their accounts.

Are you interested in contributing a pull request for this task?

None