Backport 5999: Increase ATX limits to 6.0 Mio

[fasmat]

Motivation

Backport of #5999

Description

This PR backports #5999 for the v1.5 branch

Test Plan

• n/a

TODO

• Explain motivation or link existing issue(s)
• Test changes and document test plan
• Update documentation as needed
• Update changelog as needed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.6%. Comparing base (efdd848) to head (03e0cef).
Report is 1 commits behind head on v1.5.

Additional details and impacted files

@@           Coverage Diff           @@
##            v1.5   #6000     +/-   ##
=======================================
- Coverage   80.6%   80.6%   -0.1%     
=======================================
  Files        286     286             
  Lines      29818   29815      -3     
=======================================
- Hits       24039   24036      -3     
  Misses      4159    4159             
  Partials    1620    1620             

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