Bump jupyter-contrib-nbextensions from 0.5.1 to 0.7.0

Bumps [jupyter-contrib-nbextensions](https://github.com/ipython-contrib/jupyter_contrib_nbextensions) from 0.5.1 to 0.7.0.
- [Release notes](https://github.com/ipython-contrib/jupyter_contrib_nbextensions/releases)
- [Changelog](https://github.com/ipython-contrib/jupyter_contrib_nbextensions/blob/master/CHANGELOG.md)
- [Commits](ipython-contrib/jupyter_contrib_nbextensions@0.5.1...0.7.0)

---
updated-dependencies:
- dependency-name: jupyter-contrib-nbextensions
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Otherfiles/doc-requirements.txt

@@ -3,6 +3,6 @@ notebook==5.7.4
 nbformat==5.0.8
 traitlets==4.3.3
 nbconvert==5.6.1
-jupyter_contrib_nbextensions==0.5.1
+jupyter_contrib_nbextensions==0.7.0
 MarkupSafe==2.0.1
 jinja2==2.10.1