It's time again to update sagenb. Package at http://www.math-cs.gordon.edu/~kcrisman/sagenb-0.11.6.1.tar

Note there is a circular dependency with #10295: both tickets need to be merged together.

Depends on #19671
Depends on #10295

CC: @novoselt @kiwifb

Component: notebook

Author: Karl-Dieter Crisman

Branch/Commit: bed31b2

Reviewer: Jeroen Demeyer, Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/19616