Bump nbconvert from 6.5.0 to 6.5.1 (#15)

Bumps [nbconvert](https://github.com/jupyter/nbconvert) from 6.5.0 to 6.5.1.
- [Release notes](https://github.com/jupyter/nbconvert/releases)
- [Commits](jupyter/nbconvert@6.5...6.5.1)

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

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requirements.txt

@@ -34,7 +34,7 @@ jupyterlab-pygments==0.2.2
 MarkupSafe==2.1.1
 mistune==2.0.3
 nbclient==0.6.6
-nbconvert==6.5.0
+nbconvert==6.5.1
 nbformat==5.4.0
 nbsphinx==0.8.9
 nest-asyncio==1.5.5