hexbin package missing in quarto build of single arm pos results outputs

[yonisidi]

first figure in results is missing because of missing suggests dependency of ggplot2::geom_hex() 02l_single_arm_pos.qmd

Warning: Computation failed in `stat_binhex()`.
Caused by error in `compute_group()`:
! The package "hexbin" is required for `stat_bin_hex()`

[andrew-bean]

Thanks a lot @yonisidi for bringing this to our attention - will address it shortly.