add codecov specific version

[cfaur09]

Description of the reasoning behind the pull request (what feature was missing / how the problem was manifesting itself / what was the motive behind the refactoring)

• Sometimes codecov throw errors when trying to upload the report

Proposed Changes

• add a specific codecov version to fix the problem

How to test

• all github actions should be triggered correctly

[codecov-commenter]

Codecov Report

Base: 26.93% // Head: 26.93% // No change to project coverage :thumbsup:

Coverage data is based on head (1d8f70d) compared to base (8682c36). Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff              @@
##           development     #895   +/-   ##
============================================
  Coverage        26.93%   26.93%           
============================================
  Files                7        7           
  Lines              245      245           
  Branches             8        8           
============================================
  Hits                66       66           
  Misses             171      171           
  Partials             8        8           

Flag	Coverage Δ
unittests	26.93% <ø> (ø)

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