fix(cubesql): array_upper && array_lower UDFs return type fix

[gandronchik]

No description provided.

[codecov]

Codecov Report

Merging #5136 (9d5fbe6) into master (b710c95) will decrease coverage by 0.00%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master    #5136      +/-   ##
==========================================
- Coverage   74.45%   74.45%   -0.01%     
==========================================
  Files         268      268              
  Lines       31142    31144       +2     
  Branches     2912     2912              
==========================================
+ Hits        23187    23188       +1     
- Misses       7453     7454       +1     
  Partials      502      502              

Flag	Coverage Δ
cube-backend	60.09% <ø> (ø)
cubesql	82.93% <85.71%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
rust/cubesql/cubesql/src/compile/mod.rs	80.97% <80.00%> (-0.03%)	⬇️
rust/cubesql/cubesql/src/compile/engine/udf.rs	86.84% <100.00%> (+0.08%)	⬆️

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