fix: Dependabot yml file structure

[tuliomir]

After adding the Dependabot configuration YML on #340 , subsequent PRs started displaying errors on the CI due to incorrect configuration:

The property '#/updates' of type object did not match the following type: array

While fixing it, by just adding the missing - character on the YML, I also noticed on the docs other properties that could be useful to us, such as personalized labels. So, this PR also adds these other properties.

Acceptance Criteria

• The Dependabot must run correctly on the dev branch

Security Checklist

• Make sure you do not include new dependencies in the project unless strictly necessary and do not include dev-dependencies as production ones. More dependencies increase the possibility of one of them being hijacked and affecting us.