Fix compile issue in json_chunked_reader.cpp

[ttnghia]

This issue was introduced in #12017 merged, which triggers compiler error on some systems:

../tests/io/json_chunked_reader.cpp: In function 'std::vector<cudf::io::table_with_metadata> skeleton_for_parellel_chunk_reader(cudf::host_span<std::unique_ptr<cudf::io::datasource> >, const cudf::io::json_reader_options&, int32_t, rmm::cuda_stream_view, rmm::mr::device_memory_resource*)':
../tests/io/json_chunked_reader.cpp:78:19: error: loop variable '<structured bindings>' creates a copy from type 'const std::pair<int, int>' [-Werror=range-loop-construct]
   78 |   for (auto const [chunk_start, chunk_end] : record_ranges) {
      |                   ^~~~~~~~~~~~~~~~~~~~~~~~
../tests/io/json_chunked_reader.cpp:78:19: note: use reference type to prevent copying
   78 |   for (auto const [chunk_start, chunk_end] : record_ranges) {
      |                   ^~~~~~~~~~~~~~~~~~~~~~~~
      |                   &

Fixing it is just by following the compiler recommendation: "use reference type to prevent copying".

[codecov]

Codecov Report

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Additional details and impacted files

@@               Coverage Diff               @@
##             branch-23.02   #12280   +/-   ##
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  Coverage                ?   88.21%           
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  Files                   ?      137           
  Lines                   ?    22684           
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  Hits                    ?    20011           
  Misses                  ?     2673           
  Partials                ?        0           

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[ttnghia]

@gpucibot merge