UCell version 2.8

New in this release (Bioconductor 3.19):

• Add support for multi-layer objects in Seurat v5. Added dependency on Seurat >= 5.0.
• Change default for chunk.size to 100. On parallelized jobs, this can improve up to 2-fold execution time.
• Smaller test dataset (30 cells), to speed up package function checks.