fix(renovate): wrong manager for docker

[DjinnS]

fixes #397

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.99%. Comparing base (8b11816) to head (952f3b7).
Report is 5 commits behind head on main.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #398   +/-   ##
=======================================
  Coverage   50.99%   50.99%           
=======================================
  Files          73       73           
  Lines        4334     4334           
=======================================
  Hits         2210     2210           
  Misses       1935     1935           
  Partials      189      189           

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