fix an OverflowError when showing pl.UInt64 values

[mwouts]

Closes #299

[github-actions]

Thank you for making this pull request.

Did you know? You can try it on Binder: .

Also, the version of ITables developed in this PR can be installed with pip:

pip install git+https://github.com/mwouts/itables.git@fix_299

(this requires nodejs, see more at Developing ITables)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.19%. Comparing base (a2044f4) to head (21aa76c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #300   +/-   ##
=======================================
  Coverage   96.19%   96.19%           
=======================================
  Files          27       27           
  Lines        1182     1183    +1     
=======================================
+ Hits         1137     1138    +1     
  Misses         45       45           

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