Enable dependabot automerge

[mstruebing]

i.e.:

• https://github.com/mstruebing/elmodoro/blob/main/.github/workflows/dependabot-automerge.yaml
• https://github.com/d2iq/ui-kit/blob/main/.github/workflows/dependabot-automations.yml

This requires some setup of the repository.

@janedbal are you willing to do this? If so I can give you broader access to the repository.
Otherwise I can do it but I'm not sure when I will find the time.

[janedbal]

Hi, not sure when I would get to it.

Anyway, I dont really mind clicking merge once a month. At least I quickly check the release notes and possibly adjust some tooling setup.