[Debian-med-packaging] Bug#1061761: snakemake issues with Python 3.12

[Rebecca N. Palmer]

It looks like this is at least two issues:
- Tests mix tabs and spaces, which is no longer allowed = upstream 2459
- Assumes f-strings are not tokenized, which they now are = upstream 
2485/2588/2649

Fix in progress on the debian-v7 branch.  (The main branch has 8.x, 
which doesn't work due to missing dependencies.)