Fix the minimum Python version.

[tobiasraabe]

Changes

Provide a description and/or bullet points to describe the changes in this PR.

Todo

• Reference issues which can be closed due to this PR with "Closes #x".
• Review whether the documentation needs to be updated.
• Document PR in docs/changes.rst.

[codecov]

Codecov Report

Merging #17 (a450635) into main (8712593) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #17   +/-   ##
=======================================
  Coverage   96.86%   96.86%           
=======================================
  Files           6        6           
  Lines         255      255           
=======================================
  Hits          247      247           
  Misses          8        8           

Flag	Coverage Δ
end_to_end	95.29% <ø> (ø)
unit	36.07% <ø> (ø)

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