Bump ipykernel from 6.25.2 to 6.26.0 (mosaicml#2686)

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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

setup.py

@@ -104,7 +104,7 @@ def package_files(prefix: str, directory: str, extension: str):
     'pytest==7.4.3',
     'toml==0.10.2',
     'ipython==8.11.0',
-    'ipykernel==6.25.2',
+    'ipykernel==6.26.0',
     'jupyter==1.0.0',
     'yamllint==1.32.0',
     'recommonmark==0.7.1',