test: update screenshotter

[ylemkimon]

What is the previous behavior before this PR?

Outdated screenshots

What is the new behavior after this PR?

Updated screenshots.

• Firefox: Includegraphics
• Chrome/Safari: multiple small shifts

diff.zip

[ylemkimon]

With the current setup, screenshots should be manually tested (CIs run with the old version).

[codecov]

Codecov Report

Merging #3699 (5c46a59) into main (176552a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #3699   +/-   ##
=======================================
  Coverage   92.97%   92.97%           
=======================================
  Files          91       91           
  Lines        6765     6765           
  Branches     1571     1571           
=======================================
  Hits         6290     6290           
  Misses        437      437           
  Partials       38       38           

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