Bump ipykernel from 6.25.2 to 6.26.0

Bumps [ipykernel](https://github.com/ipython/ipykernel) from 6.25.2 to 6.26.0.
- [Release notes](https://github.com/ipython/ipykernel/releases)
- [Changelog](https://github.com/ipython/ipykernel/blob/main/CHANGELOG.md)
- [Commits](ipython/ipykernel@v6.25.2...v6.26.0)

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

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