Bump markupsafe from 2.0.1 to 2.1.5

Bumps [markupsafe](https://github.com/pallets/markupsafe) from 2.0.1 to 2.1.5.
- [Release notes](https://github.com/pallets/markupsafe/releases)
- [Changelog](https://github.com/pallets/markupsafe/blob/main/CHANGES.rst)
- [Commits](pallets/markupsafe@2.0.1...2.1.5)

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

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

Otherfiles/doc-requirements.txt

@@ -4,5 +4,5 @@ nbformat==5.0.8
 traitlets==4.3.3
 nbconvert==5.6.1
 jupyter_contrib_nbextensions==0.5.1
-MarkupSafe==2.0.1
+MarkupSafe==2.1.5
 jinja2==2.10.1