Bump ipywidgets from 7.7.1 to 7.7.2

Bumps [ipywidgets](https://github.com/jupyter-widgets/ipywidgets) from 7.7.1 to 7.7.2.
- [Release notes](https://github.com/jupyter-widgets/ipywidgets/releases)
- [Commits](https://github.com/jupyter-widgets/ipywidgets/compare/7.7.1...7.7.2)

---
updated-dependencies:
- dependency-name: ipywidgets
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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