Upgrade jupyterlab to 3.3.x, add "sage -n nbclassic" and "sage -n retrolab"

[mkoeppe]

#30246 added jupyterlab 2.2.x as an optional package as part of Meta-ticket #30399.

The 3.0 series has been out since December 2020. https://pypi.org/project/jupyterlab/#history

Current as of Mar 2022 is 3.3.0. It still supports Python 3.7, as needed for Sage 9.6.

It is now also possible to run the classic notebook on top of jupyterlab - https://pypi.org/project/nbclassic/
(See also https://github.com/jupyterlab/retrolab#relation-to-other-jupyter-frontends)

CC: @slel @jcamp0x2a @dimpase @egourgoulhon

Component: packages: optional

Keywords: jupyterlab

Author: Matthias Koeppe

Branch/Commit: 1243bd8

Reviewer: Eric Gourgoulhon

Issue created by migration from https://trac.sagemath.org/ticket/32069

[mkoeppe]

Dependencies: #31280

[mkoeppe]

Changed dependencies from #31280 to #31280, #32071

[mkoeppe]

Description changed:

--- 
+++ 
@@ -3,4 +3,5 @@
 The 3.0 series has been out since December 2020. https://pypi.org/project/jupyterlab/#history 
 Current as of June 2021 is 3.0.16.
 
+It is now also possible to run the classic notebook on top of jupyterlab - https://pypi.org/project/nbclassic/
 

[mkoeppe]

Branch: u/mkoeppe/upgrade_jupyterlab_to_3_0_x

[mkoeppe]

Last 10 new commits:

2694cbf	build/pkgs/requests/checksums.ini: Add upstream_url
62769f9	build/pkgs/rst2ipynb/checksums.ini: Add upstream_url
eb6d3d0	build/pkgs/scandir/checksums.ini: Add upstream_url
e2cada9	build/pkgs/snowballstemmer/checksums.ini: Add upstream_url
d83e2f8	build/pkgs/wcwidth/checksums.ini: Add upstream_url
c943913	build/pkgs/{backcall,ptyprocess}/dependencies: flit_core switched from pytoml to toml; remove pytoml package
6225684	Merge #31280
0075b33	build/pkgs/{scipy,sphinx,sympy}/install-requires.txt: Update version ranges to include the version in package-version.txt
5116399	Merge #32071
62e5a88	build/pkgs/jupyterlab: Update to 3.0.x

[mkoeppe]

Author: Matthias Koeppe

[mkoeppe]

Commit: 62e5a88

[sagetrac-git]

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

b348305	Merge tag '9.4.beta4' into t/31280/jupyter_upgrade
2582707	build/pkgs/ptyprocess: Revert upgrade to 0.7.0; pin version to 0.5.1
45cf013	build/pkgs/rst2ipynb/patches: Remove
7762e01	Merge #31280

[sagetrac-git]

Changed commit from 62e5a88 to 7762e01

[mkoeppe]

Changed dependencies from #31280, #32071 to #31280