Upgrade to jupyter notebook 5.7.1

[slel]

Quoting the release announcement for notebook 5.7.1:

The only change in this release is a security fix. An oversight in earlier versions
meant that using the 'print preview' feature on a malicious notebook could
allow it to run untrusted Javascript in the notebook server context. This
potentially means it could start a kernel and run code on your computer.

It's recommended to upgrade as soon as practical.

• Tarball: https://files.pythonhosted.org/packages/2a/6b/5b8377eff772dcbab3d8bd597f2fb487e4c5cebb8b3254b2b5124d6d0a46/notebook-5.7.1.tar.gz

Our previous upgrade was to notebook 5.7.0 in #26174, so this should be easy.

CC: @kiwifb @jdemeyer @bryangingechen @slel

Component: packages: standard

Keywords: upgrade, jupyter, notebook

Author: Bryan Gin-ge Chen

Branch/Commit: fc9b8c3

Reviewer: Volker Braun

Issue created by migration from https://trac.sagemath.org/ticket/26709

[bryangingechen]

Branch: public/notebook-5.7.1

[bryangingechen]

Commit: 8dafc4e

[sagetrac-git]

Changed commit from 8dafc4e to fc9b8c3

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

fc9b8c3

Update notebook to 5.7.1

[vbraun]

Reviewer: Volker Braun

[vbraun]

Author: Samuel Lelièvre

[bryangingechen]

Changed author from Samuel Lelièvre to Bryan Gin-ge Chen

[vbraun]

Changed branch from public/notebook-5.7.1 to fc9b8c3