Fix conversion overflow false positive when using ParseUint

[ben-krieger]

Extends the check for ParseInt (with proper bit size) to ParseUint.

Two tests were added.

1. To check that ParseUint does not cause a false positive
2. To check that ParseInt causes a true positive when casting to unsigned

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.35%. Comparing base (c52dc0e) to head (7029667).
Report is 1 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1192   +/-   ##
=======================================
  Coverage   67.34%   67.35%           
=======================================
  Files          74       74           
  Lines        4045     4046    +1     
=======================================
+ Hits         2724     2725    +1     
  Misses       1195     1195           
  Partials      126      126           

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