Bump notebook from 6.0.0 to 6.4.10

Bumps [notebook](http://jupyter.org) from 6.0.0 to 6.4.10.

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

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

requirements.txt

@@ -49,7 +49,7 @@ msgpack==0.6.2
 multipledispatch==0.6.0
 nbconvert==5.5.0
 nbformat==4.4.0
-notebook==6.0.0
+notebook==6.4.10
 numba==0.46.0
 numpy==1.16.4
 packaging==19.2