remove non-reproducible timestamp

[hboutemy]

see https://github.com/jvm-repo-rebuild/reproducible-central/blob/master/content/org/apache/systemds/README.md

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.71%. Comparing base (5f390b3) to head (3cdbadf).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #2257   +/-   ##
=========================================
  Coverage     72.71%   72.71%           
+ Complexity    45800    45798    -2     
=========================================
  Files          1474     1474           
  Lines        171866   171866           
  Branches      33585    33585           
=========================================
+ Hits         124976   124977    +1     
+ Misses        37457    37453    -4     
- Partials       9433     9436    +3     

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