:construction: fix ci runs (mamba and numpy related)

[enryH]

• see if snakemake envs are somehow cached

[enryH]

ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
blis 1.0.1 requires numpy<3.0.0,>=2.0.0, but you have numpy 1.26.4 which is incompatible.
thinc 8.3.2 requires numpy<2.1.0,>=2.0.0; python_version >= "3.9", but you have numpy 1.26.4 which is incompatible.
Successfully installed autograd-1.7.0 autograd-gamma-0.5.0 category-encoders-2.6.4 formulaic-1.0.2 interface-meta-1.3.0 lifelines-0.29.0 llvmlite-0.43.0 mrmr-selection-0.2.8 njab-0.0.8 numba-0.60.0 numpy-1.26.4 polars-1.9.0 pynndescent-0.5.13 umap-learn-0.5.6

lifelines currently still relies on numpy below 2.0

• other packages use later numpy version. lifelines is installed partly by njab, where it is used to plot km curves. Better to not include it in the default installation then.

Errors were created installing njab separatly without pimms.

[enryH]

• [x] removed scipy as a direct dependency
• [x] removed other dependencies which are not used in pkg directly (but might be needed in workflows). njab installs these
• [x] njab (other repo) now does not always install lifelines
• [ ] fix bugs on Ubuntu with latest package versions