Use int32_t in TimeValue

[kevinbackhouse]

Use int32_t which is guaranteed to be the same size on all platforms.

[codecov]

Codecov Report

Merging #2280 (d0a6074) into main (dc4ae73) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2280   +/-   ##
=======================================
  Coverage   63.52%   63.52%           
=======================================
  Files         118      118           
  Lines       19600    19600           
  Branches     9560     9560           
=======================================
  Hits        12450    12450           
  Misses       5082     5082           
  Partials     2068     2068           

Impacted Files	Coverage Δ
include/exiv2/value.hpp	84.44% <ø> (ø)
src/value.cpp	72.78% <100.00%> (ø)

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