chore: update to image_builder 6.1.0 (bug 1989274)

[JohanLorenzo]

https://hub.docker.com/layers/mozillareleases/image_builder/6.1.0/images/sha256-10c614e928500a7d5138773fb58941a24a17948e1a8193768e9ba762ba3e9c7e

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.50%. Comparing base (1932d08) to head (40a6650).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #799   +/-   ##
=======================================
  Coverage   75.50%   75.50%           
=======================================
  Files         130      130           
  Lines       10945    10945           
  Branches     1404     1404           
=======================================
  Hits         8264     8264           
  Misses       2304     2304           
  Partials      377      377           

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