Does not work properly with grouped PRs

[niklasga]

See https://github.com/FortnoxAB/changesets-java/pull/104/files for example where the generated changeset became this:

---
"changesets": patch
---

- org.apache.maven.plugins:maven-invoker-plugin, org.apache.maven.plugins:maven-gpg-plugin: 

[niklasga]

The metadata step does not seem to include versions for any of the updated dependencies when grouped like this:

Outputting metadata for 7 updated dependencies
  outputs.dependency-names: org.apache.maven:maven-plugin-api, org.apache.maven:maven-core, org.apache.maven:maven-artifact, org.apache.maven:maven-compat, org.apache.maven.plugins:maven-invoker-plugin, com.diffplug.spotless:spotless-maven-plugin, org.apache.maven.plugins:maven-gpg-plugin
  outputs.dependency-type: direct:production
  outputs.update-type: version-update:semver-minor
  outputs.directory: /
  outputs.package-ecosystem: maven
  outputs.target-branch: main
  outputs.previous-version: 
  outputs.new-version: 
  outputs.compatibility-score: 0
  outputs.maintainer-changes: false
  outputs.dependency-group: maven-plugins
  outputs.alert-state: 
  outputs.ghsa-id: 
  outputs.cvss: 0

Taken from the job here (see the step named "Run FortnoxAB/changesets-java-dependabot-action@main")

This would definitely be improved by generating separate lines in the changeset, but not sure how useful it is without any versions 🤔