ci: bump outdated action versions in update-owl workflow

[ypriverol]

Summary

Bumps the three outdated GitHub Actions in .github/workflows/update-owl.yaml to current majors. All run on Node 20.

• actions/checkout: v3 → v4
• peter-evans/create-pull-request: v4 → v6
• peter-evans/enable-pull-request-automerge: v2 → v3

Notes

• validate-obo.yml and validate-owl.yaml already track current majors (actions/checkout@v4, actions/setup-java@v4, actions/cache@v4, actions/upload-artifact@v4) — no changes needed there.
• The mathieudutour/github-tag-action@v5.6 → v6.2 bump is handled in the issue Need CV term for associated files #179 branch (PR for that branch separately) and is intentionally omitted here to avoid merge conflicts.
• juliangruber/approve-pull-request-action@v1 is left as-is (no widely-adopted v2 release at time of writing).

Test plan

• Wait for next push to master to trigger the Update OWL workflow and verify it completes without set-output deprecation warnings or Node 16 deprecation warnings
• Confirm the auto-PR for the OWL update is created, approved, and auto-merged successfully

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 0e68e569-729c-429c-99e2-355a57d6f13d

📥 Commits

Reviewing files that changed from the base of the PR and between ccd4bb4 and 39d6059.

📒 Files selected for processing (1)

• .github/workflows/update-owl.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/bump-action-versions

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