chore(deps): update dependency @edx/paragon to v21.5.6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@edx/paragon	21.5.5 -> 21.5.6

---

Release Notes

openedx/paragon (@​edx/paragon)

### [`v21.5.6`](https://togithub.com/openedx/paragon/releases/tag/v21.5.6) [Compare Source](https://togithub.com/openedx/paragon/compare/v21.5.5...v21.5.6) ##### Bug Fixes - Update docs for a final publish before we move this package. ([22dd0c4](https://togithub.com/openedx/paragon/commit/22dd0c486cc5a4d49f2aaf2b49a3b1ff4bfcf9f3))

---

Configuration

📅 Schedule: Branch creation - "before 4am on Monday" in timezone America/New_York, Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by Mend Renovate. View repository job log here.