Fixes cgroup ID parsing in newer docker versions

[mariomac]

Fixes issue: #1277

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.42%. Comparing base (a112937) to head (3d02132).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1287      +/-   ##
==========================================
+ Coverage   76.69%   80.42%   +3.73%     
==========================================
  Files         140      140              
  Lines       14066    14067       +1     
==========================================
+ Hits        10788    11314     +526     
+ Misses       2721     2214     -507     
+ Partials      557      539      -18     

Flag	Coverage Δ
integration-test	59.28% <0.00%> (+0.06%)	⬆️
k8s-integration-test	58.05% <100.00%> (?)
oats-test	35.23% <0.00%> (-0.03%)	⬇️
unittests	52.36% <100.00%> (+<0.01%)	⬆️

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