Review with next release of fractal-tasks-core

[tcompa]

fractal-tasks-core 0.10.1 is currently broken, due to https://github.com/fractal-analytics-platform/fractal-tasks-core/issues/508. As soon as we have a new release, in principle there should be no remaining glitches in the proof-of-principle workflow execution (provisional workaround: https://github.com/exactlab/fractal-containers/issues/9#issuecomment-1705230181).

[tcompa]

To do:

• [x] Review with next release
• [x] Update source attributes in workflow JSON file
• [x] Remove corresponding warning from README

[tcompa]

Tested with tasks package 0.11.0a0, and it does work. I'm updating everything to the upcoming release 0.11.0 (not yet available).