Fix rtol for scipy iterative solver, bump version

[michalk8]

closes #1235

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.41%. Comparing base (82248b2) to head (3a4f159).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1237      +/-   ##
==========================================
- Coverage   79.47%   79.41%   -0.07%     
==========================================
  Files          51       51              
  Lines        8604     8603       -1     
  Branches     2251     1489     -762     
==========================================
- Hits         6838     6832       -6     
- Misses       1193     1195       +2     
- Partials      573      576       +3     

Files with missing lines	Coverage Δ
src/cellrank/_utils/_linear_solver.py	40.32% <100.00%> (-0.32%)	⬇️

... and 2 files with indirect coverage changes