build(deps): bump nbconvert from 6.0.7 to 7.8.0

Bumps [nbconvert](https://github.com/jupyter/nbconvert) from 6.0.7 to 7.8.0.
- [Release notes](https://github.com/jupyter/nbconvert/releases)
- [Changelog](https://github.com/jupyter/nbconvert/blob/main/CHANGELOG.md)
- [Commits](jupyter/nbconvert@6.0.7...v7.8.0)

---
updated-dependencies:
- dependency-name: nbconvert
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

setup.py

@@ -44,7 +44,7 @@
         "fulldev": dev_dep + driver_dep
     },
     install_requires=[
-        "nbconvert==6.0.7",
+        "nbconvert==7.8.0",
         "nest_asyncio==1.5.1",
         "ipywidgets==7.6.5",
         "papermill==2.3.3",