fix: docker notebook python version

[janfb]

small fix for dev container.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.33%. Comparing base (8afd985) to head (7a4711a).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1258      +/-   ##
==========================================
- Coverage   86.05%   78.33%   -7.73%     
==========================================
  Files         118      119       +1     
  Lines        8672     8685      +13     
==========================================
- Hits         7463     6803     -660     
- Misses       1209     1882     +673     

Flag	Coverage Δ
unittests	78.33% <ø> (-7.73%)	⬇️

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see 28 files with indirect coverage changes