Add fractal-hcs-converters package to task list

Author: jluethi

tasks_data_retrieval/sources.txt

@@ -6,4 +6,5 @@ https://github.com/fractal-analytics-platform/fractal-helper-tasks
 https://github.com/fmi-basel/gliberal-scMultipleX
 https://github.com/m-albert/fractal-ome-zarr-hcs-stitching
 https://github.com/pelkmanslab/abbott
-https://github.com/Apricot-Therapeutics/APx_fractal_task_collection
+https://github.com/Apricot-Therapeutics/APx_fractal_task_collection
+https://github.com/fractal-analytics-platform/fractal-hcs-converters