CHORE: Implement Renovate to keep dependencies updated

[dhoard]

Chore

Implement Renovate to keep dependencies updated. It's free, but requires adding the application to the GitHub repository and a renovate.json file.

Example renovate.json configuration file:

{
  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
  "extends": ["config:recommended"],
  "dependencyDashboard": false,
  "packageRules": [
    {
      "matchManagers": ["maven-wrapper"],
      "allowedVersions": "3.9.6",
      "groupName": "Maven wrapper pinned to 3.9.6"
    },
    {
      "matchManagers": ["maven"],
      "groupName": "Maven dependencies"
    }
  ]