Fix types for compatibility with int128

[mborland]

See: https://github.com/cppalliance/int128

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.84%. Comparing base (bb1a428) to head (c5ede94).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #288   +/-   ##
========================================
  Coverage    94.84%   94.84%           
========================================
  Files           73       73           
  Lines         8986     8986           
========================================
  Hits          8523     8523           
  Misses         463      463           

Files with missing lines	Coverage Δ
...ude/boost/charconv/detail/integer_search_trees.hpp	99.25% <100.00%> (ø)
...de/boost/charconv/detail/to_chars_integer_impl.hpp	96.89% <100.00%> (ø)

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