Update dependency ipython to v8.21.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ipython (source)	8.15.0 -> 8.21.0

---

Release Notes

ipython/ipython (ipython)

### [`v8.21.0`](https://togithub.com/ipython/ipython/compare/8.20.0...8.21.0) [Compare Source](https://togithub.com/ipython/ipython/compare/8.20.0...8.21.0) ### [`v8.20.0`](https://togithub.com/ipython/ipython/compare/8.19.0...8.20.0) [Compare Source](https://togithub.com/ipython/ipython/compare/8.19.0...8.20.0) ### [`v8.19.0`](https://togithub.com/ipython/ipython/compare/8.18.1...8.19.0) [Compare Source](https://togithub.com/ipython/ipython/compare/8.18.1...8.19.0) ### [`v8.18.1`](https://togithub.com/ipython/ipython/compare/8.18.0...8.18.1) [Compare Source](https://togithub.com/ipython/ipython/compare/8.18.0...8.18.1) ### [`v8.18.0`](https://togithub.com/ipython/ipython/compare/8.17.2...8.18.0) [Compare Source](https://togithub.com/ipython/ipython/compare/8.17.2...8.18.0) ### [`v8.17.2`](https://togithub.com/ipython/ipython/compare/8.17.1...8.17.2) [Compare Source](https://togithub.com/ipython/ipython/compare/8.17.1...8.17.2) ### [`v8.17.1`](https://togithub.com/ipython/ipython/compare/8.17.0...8.17.1) [Compare Source](https://togithub.com/ipython/ipython/compare/8.17.0...8.17.1) ### [`v8.16.0`](https://togithub.com/ipython/ipython/compare/8.15.0...8.16.0) [Compare Source](https://togithub.com/ipython/ipython/compare/8.15.0...8.16.0)

---

Configuration

📅 Schedule: Branch creation - "every weekend" in timezone US/Eastern, 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.