Bump ipython from 8.31.0 to 8.34.0 in /backend

Bumps [ipython](https://github.com/ipython/ipython) from 8.31.0 to 8.34.0.
- [Release notes](https://github.com/ipython/ipython/releases)
- [Commits](ipython/ipython@8.31.0...8.34.0)

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

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

Author: dependabot[bot]