Update jira to v8.21.0

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/atlassian/jira-data-center/jira-node	minor	8.18.1 -> 8.21.0

issue #7 (closed)

Configuration

📅 Schedule: At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Renovate will not automatically rebase this PR, because other commits have been found.

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

---

This MR has been generated by Renovate Bot.