build(deps): bump ipython from 8.20.0 to 8.21.0

Bumps [ipython](https://github.com/ipython/ipython) from 8.20.0 to 8.21.0.
- [Release notes](https://github.com/ipython/ipython/releases)
- [Commits](ipython/ipython@8.20.0...8.21.0)

---
updated-dependencies:
- dependency-name: ipython
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>