chore: update manifest to 3.1.0

[github-actions]

Manifest update

Version: 3.0.0 → 3.1.0 (minor)

Changelog

• catalog_specs.yaml: updated

---

Once merged, publish the release:

gh workflow run publish.yml \
  -R WCRP-CMIP/esgvoc_registry \
  -f project_id=obs4ref \
  -f bump_type=minor \
  -f project_repo=Climate-REF/Obs4REF_CVs

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