Replaced Display by Debug in Utf8Array

[jorgecarleitao]

A leftover that should have been addressed as part of #694

[codecov]

Codecov Report

Merging #705 (51739cc) into main (f583531) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #705      +/-   ##
==========================================
+ Coverage   70.34%   70.37%   +0.02%     
==========================================
  Files         308      309       +1     
  Lines       16816    16967     +151     
==========================================
+ Hits        11830    11940     +110     
- Misses       4986     5027      +41     

Impacted Files	Coverage Δ
src/array/utf8/mod.rs	87.65% <ø> (ø)
src/io/avro/write/compress.rs	100.00% <0.00%> (ø)
src/io/avro/read/schema.rs	53.68% <0.00%> (+1.05%)	⬆️
src/io/avro/read/decompress.rs	84.31% <0.00%> (+2.49%)	⬆️
src/io/parquet/read/mod.rs	50.15% <0.00%> (+5.39%)	⬆️
src/io/avro/write/header.rs	100.00% <0.00%> (+40.00%)	⬆️

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