fix: Ensure that test for increasing offsets is not affected by overflow

[paleolimbot]

Closes #290.

This PR fixes the check for increasing offsets: previously it calculated a diff between pairs of elements and ensured that the value was > 0. This failed for expressions like int32_t diff = (int32_t)-2147483648 - (int32_t)2080374784, where because of overflow, diff evalutes to > 0.

[lidavidm]

Is it possible to add a test to check the overflow case?

[codecov-commenter]

Codecov Report

Merging #291 (b009352) into main (a3f0929) will increase coverage by 0.01%.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #291      +/-   ##
==========================================
+ Coverage   87.03%   87.05%   +0.01%     
==========================================
  Files          66       66              
  Lines       10329    10325       -4     
==========================================
- Hits         8990     8988       -2     
+ Misses       1339     1337       -2     

Files Changed	Coverage Δ
src/nanoarrow/array.c	91.39% <100.00%> (-0.03%)	⬇️

... and 1 file with indirect coverage changes

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