Fixed s3 example

[jorgecarleitao]

There was a compilation error in the s3 example. It seems that Cargo test does not cover examples within packages, so we will also need to add CI tooling to check them.

[codecov]

Codecov Report

Merging #536 (34e4960) into main (13f8d09) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #536      +/-   ##
==========================================
+ Coverage   81.28%   81.34%   +0.06%     
==========================================
  Files         380      380              
  Lines       23432    23938     +506     
==========================================
+ Hits        19046    19472     +426     
- Misses       4386     4466      +80     

Impacted Files	Coverage Δ
src/io/parquet/write/record_batch.rs	84.61% <0.00%> (-6.69%)	⬇️
src/io/parquet/read/mod.rs	56.25% <0.00%> (-3.35%)	⬇️
tests/it/io/parquet/mod.rs	95.14% <0.00%> (-0.78%)	⬇️
src/io/parquet/read/boolean/nested.rs	87.32% <0.00%> (-0.68%)	⬇️
src/io/parquet/read/binary/nested.rs	87.05% <0.00%> (-0.25%)	⬇️
src/io/parquet/read/binary/basic.rs	83.87% <0.00%> (-0.24%)	⬇️
src/io/parquet/write/utils.rs	86.58% <0.00%> (-0.18%)	⬇️
src/io/parquet/read/boolean/basic.rs	91.52% <0.00%> (-0.15%)	⬇️
src/io/parquet/write/utf8/basic.rs	91.93% <0.00%> (-0.07%)	⬇️
src/io/parquet/mod.rs	0.00% <0.00%> (ø)
... and 15 more

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