Provide a dependabot configuration

[apupier]

it will allow to have Pull Request created automatically to update dependencies

Before you submit a pull request please acknowledge the following:

• [x] You have signed an Eclipse Contributor Agreement and are committing using the same email address
• [x] Your code contains any tests relevant to the problem you are solving
• [x] All new and existing tests passed
• [x] Code follows the style guidelines and Checkstyle passes

See CONTRIBUTING for more information.

[eclipse-milo-bot]

Can one of the admins verify this patch?

[eclipse-milo-bot]

Can one of the admins verify this patch?