In this ticket, we upgrade to:

• decorator 4.3.0 (from 4.0.6.p0)
• ipykernel 4.8.2 (from 4.7.0)
• jupyter_client 5.2.3 (from 5.2.2)
• notebook 5.5.0 (from 5.3.1)
• scandir 1.7 (from 1.6)
• send2trash 1.5.0 (from 1.4.2) (Send2Trash on PyPI)

CC: @embray @jdemeyer @slel @sagetrac-tmonteil @vbraun

Component: packages: standard

Keywords: upgrade, decorator, ipykernel, jupyter_client, notebook, ptyprocess, pyzmq, scandir, send2trash, setuptools, tornado

Author: Volker Braun

Branch/Commit: 61a8ec7

Reviewer: Jeroen Demeyer

Issue created by migration from https://trac.sagemath.org/ticket/25638