Bump nbconvert from 6.0.7 to 7.17.0 in /tests/notebooks

Bumps [nbconvert](https://github.com/jupyter/nbconvert) from 6.0.7 to 7.17.0.
- [Release notes](https://github.com/jupyter/nbconvert/releases)
- [Changelog](https://github.com/jupyter/nbconvert/blob/main/CHANGELOG.md)
- [Commits](jupyter/nbconvert@6.0.7...v7.17.0)

---
updated-dependencies:
- dependency-name: nbconvert
  dependency-version: 7.17.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

tests/notebooks/requirements.txt

@@ -1,7 +1,7 @@
 notebook==6.4.1
 pytest==6.1.1
 pytest-mock==3.3.1
-nbconvert==6.0.7
+nbconvert==7.17.0
 ipykernel==5.3.4
 ipywidgets==7.5.1
 matplotlib==3.3.2