[ci] fix python 3.8

[clonker]

No description provided.

[codecov]

Codecov Report

Merging #244 (d57bdfe) into main (1be1d16) will decrease coverage by 1.66%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #244      +/-   ##
==========================================
- Coverage   93.90%   92.24%   -1.67%     
==========================================
  Files         138      140       +2     
  Lines       11015    11554     +539     
==========================================
+ Hits        10344    10658     +314     
- Misses        671      896     +225     

Impacted Files	Coverage Δ
deeptime/decomposition/_vamp.py	97.14% <ø> (ø)
deeptime/markov/msm/_bayesian_msm.py	94.11% <ø> (+4.70%)	⬆️
deeptime/util/torch.py	93.49% <100.00%> (ø)
deeptime/plots/implied_timescales.py	88.88% <0.00%> (-11.12%)	⬇️
deeptime/plots/network.py	92.21% <0.00%> (-7.79%)	⬇️
deeptime/plots/chapman_kolmogorov.py	94.69% <0.00%> (-3.65%)	⬇️
deeptime/plots/util.py	100.00% <0.00%> (ø)
deeptime/plots/energy.py	100.00% <0.00%> (ø)
deeptime/util/exceptions.py	100.00% <0.00%> (ø)
deeptime/data/_pbf_simulator.py	100.00% <0.00%> (ø)
... and 8 more

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