fix(tests): use integer division when passing args to rand_string

[tipabu]

Summary of Changes

This cleans up some deprecation warnings that look like

DeprecationWarning: non-integer arguments to randrange() have been deprecated since Python 3.10 and will be removed in a subsequent version

Related Issues

1966

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[codecov[bot]]

Codecov Report

Merging #1972 (fc89727) into master (d34c27f) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master     #1972   +/-   ##
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  Coverage   100.00%   100.00%           
=========================================
  Files           63        63           
  Lines         6624      6624           
  Branches      1068      1068           
=========================================
  Hits          6624      6624           

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[CaselIT]

Thank you!