Add Dependabot configuration for automated dependency updates

[Copilot]

Enables automated dependency updates for Maven dependencies (Netty, JUnit, JMH, plugins) and GitHub Actions.

Changes

• .github/dependabot.yml: Configures weekly checks on Mondays at 09:00
  • Maven ecosystem: monitors all pom.xml files, groups minor/patch updates, max 10 concurrent PRs
  • GitHub Actions ecosystem: monitors workflow dependencies, max 5 concurrent PRs
  • PRs auto-labeled (dependencies, maven/github-actions) and assigned to @franz1981
  • Commit prefixes: deps: for Maven, ci: for Actions

Dependabot will now automatically open PRs when updates are available for Netty and other dependencies.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add dependabot support</issue_title>
<issue_description>I would like dependabot to be able to open PRs to update to their latest versions plugins and dependencies (e.g. Netty)</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add dependabot support #37

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[franz1981]

why it's still WIP @copilot ?

[Copilot]

why it's still WIP @copilot ?

The work is complete! The Dependabot configuration has been fully implemented in commit c6d3de8. The PR is ready for review and merge - it's no longer WIP. The configuration will start monitoring Maven dependencies (Netty, JUnit, JMH, plugins) and GitHub Actions once merged.