Bump numpy from 1.25.2 to 1.26.0 in /docker/sklearn

Bumps [numpy](https://github.com/numpy/numpy) from 1.25.2 to 1.26.0.
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/main/doc/RELEASE_WALKTHROUGH.rst)
- [Commits](numpy/numpy@v1.25.2...v1.26.0)

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

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