Bump ipykernel from 6.26.0 to 6.28.0 (#238)

* Bump ipykernel from 6.26.0 to 6.28.0

Bumps [ipykernel](https://github.com/ipython/ipykernel) from 6.26.0 to 6.28.0.
- [Release notes](https://github.com/ipython/ipykernel/releases)
- [Changelog](https://github.com/ipython/ipykernel/blob/main/CHANGELOG.md)
- [Commits](ipython/ipykernel@v6.26.0...v6.28.0)

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

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

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Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Aleksandr (Sasha) Berezutskii <[email protected]>