Update docker/dockerfile Docker tag to v1.20

[bruli]

This PR contains the following updates:

Package	Type	Update	Change
docker/dockerfile	syntax	minor	1.19 -> 1.20

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 22.67%. Comparing base (c87438a) to head (7b46a05).
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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #19   +/-   ##
=======================================
  Coverage   22.67%   22.67%           
=======================================
  Files          22       22           
  Lines         463      463           
=======================================
  Hits          105      105           
  Misses        357      357           
  Partials        1        1           

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