Use dependabot to version bump horreum dependencies.

[whitingjr]

Updated revision property to now manage:

• module version
• horreum dependencies version

This combines version alignment with Horreum and dependency version updates.

fixes #24

Testing done

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[johnaohara]

lgtm