pip prod(deps): update ipykernel requirement from <7.0.0 to <8.0.0

Updates the requirements on [ipykernel](https://github.com/ipython/ipykernel) to permit the latest version.
- [Release notes](https://github.com/ipython/ipykernel/releases)
- [Changelog](https://github.com/ipython/ipykernel/blob/main/CHANGELOG.md)
- [Commits](ipython/ipykernel@4.0.1...v7.0.1)

---
updated-dependencies:
- dependency-name: ipykernel
  dependency-version: 7.0.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements-testing.txt

@@ -8,4 +8,4 @@ pooch<1.8.3
 click<9.0
 cloudpickle<3.1.2
 ipympl<0.9.9
-ipykernel<7.0.0
+ipykernel<8.0.0