Merge branch 'fix/separate-development-dependencies' into 'master'
What this MR does / why does DuMux need it:
Backport !3371 (merged) to latest release 3.6 to fix CI errors caused by updated dependency.
Edited by Timo Koch
What this MR does / why does DuMux need it:
Backport !3371 (merged) to latest release 3.6 to fix CI errors caused by updated dependency.