Stop hardcoding the default Docker version

[Gallaecio]

Fixes #444

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5bc420e) 89.44% compared to head (e8b2f9a) 89.44%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #445      +/-   ##
==========================================
- Coverage   89.44%   89.44%   -0.01%     
==========================================
  Files          34       34              
  Lines        2407     2406       -1     
==========================================
- Hits         2153     2152       -1     
  Misses        254      254              

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[Gallaecio]

I’ve reproduced the original issue after upgrading my Docker version to 25+, and confirmed the fix.

Need to look into those unrelated CI issues, though.