Fix memcheck error in get_dremel_data

[davidwendt]

Description

Fixes logic that applies offsets to nested column children to not write past the end of the offsets vector.

This error was found by the nightly builds and could be recreated using

compute-sanitizer --tool memcheck gtests/PARQUET_TEST --gtest_filter=ParquetReaderTest.NestedByteArray --rmm_mode=cuda

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[codecov]

Codecov Report

Base: 87.40% // Head: 88.11% // Increases project coverage by +0.70% 🎉

Coverage data is based on head (4e44b5e) compared to base (f72c4ce).
Patch coverage: 86.42% of modified lines in pull request are covered.

Additional details and impacted files

@@               Coverage Diff                @@
##           branch-22.12   #11903      +/-   ##
================================================
+ Coverage         87.40%   88.11%   +0.70%     
================================================
  Files               133      133              
  Lines             21833    21881      +48     
================================================
+ Hits              19084    19281     +197     
+ Misses             2749     2600     -149     

Impacted Files	Coverage Δ
python/cudf/cudf/core/udf/__init__.py	97.05% <ø> (+47.05%)	⬆️
python/cudf/cudf/io/orc.py	92.94% <ø> (-0.09%)	⬇️
python/cudf/cudf/utils/ioutils.py	79.47% <ø> (ø)
...thon/dask_cudf/dask_cudf/tests/test_distributed.py	18.86% <ø> (+4.94%)	⬆️
python/cudf/cudf/core/_base_index.py	82.20% <43.75%> (-3.35%)	⬇️
python/cudf/cudf/io/text.py	91.66% <66.66%> (-8.34%)	⬇️
python/strings_udf/strings_udf/__init__.py	86.27% <76.00%> (-10.61%)	⬇️
python/cudf/cudf/core/index.py	92.91% <95.16%> (+0.28%)	⬆️
python/cudf/cudf/__init__.py	90.69% <100.00%> (ø)
python/cudf/cudf/core/column/categorical.py	89.34% <100.00%> (ø)
... and 12 more

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[davidwendt]

@gpucibot merge