bjobsusers: Fix warning in pandas 2.0

[alifbe]

Closes #758

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.15%. Comparing base (16807f3) to head (55df968).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #760   +/-   ##
=======================================
  Coverage   85.15%   85.15%           
=======================================
  Files          52       52           
  Lines        7418     7418           
=======================================
  Hits         6317     6317           
  Misses       1101     1101           

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