Add a publication to P7 datasets

[rinva]

could we add the P7 white paper in the publication section to all the P7 datasets?

Ackerman et al., 2024
https://doi.org/10.1101/2024.09.05.611438

jrc_mus-heart-1
jrc_mus-hippocampus-1
jrc_mus-kidney-3
jrc_mus-liver-3
jrc_mus-pancreas-4
jrc_mus-skin-1
jrc_mus-thymus-1