Set up Dependabot Auto-Merge

[halotroop2288]

Description

This sets up Dependabot (again) and a workflow to automatically merge PRs it makes that pass all tests. It also sets up an extra test for Kotlin.

Seeing as all the PRs open currently are from Dependabot, I figured it would be useful to have this, to keep this project up-to-date.

Please be aware that the Gradle plugin com.bmuschko.nexus is no longer supported. Please replace it.

Merging this will require a personal access token to be set up by a maintainer of this repository!

Checklist

• [x] I have checked any existing PRs for new features.
• [x] I have read and abide by the contributing guidelines.
• [x] There are no similar features already implemented.
• [x] This contains original code and is not copied from another project.
• [x] This code is final and complete.

Changes

• [ ] Protocol
• [ ] Project Structure
• [ ] Documentation
• [x] Other: Github Actions workflows and bots