Fix memcheck error in TypeInference.Timestamp gtest

[davidwendt]

Description

Fixes an error in the TypeInference.Timestamp gtest where the size parameter was incorrect.

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

compute-sanitizer --tool memcheck gtests/TYPE_INFERENCE_TEST --gtest_filter=TypeInference.Timestamp --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: 86.86% // Decreases project coverage by -0.54% ⚠️

Coverage data is based on head (5a4a828) compared to base (f72c4ce).
Patch coverage: 86.42% of modified lines in pull request are covered.

❗ Current head 5a4a828 differs from pull request most recent head 25cee52. Consider uploading reports for the commit 25cee52 to get more accurate results

Additional details and impacted files

@@               Coverage Diff                @@
##           branch-22.12   #11905      +/-   ##
================================================
- Coverage         87.40%   86.86%   -0.55%     
================================================
  Files               133      133              
  Lines             21833    21881      +48     
================================================
- Hits              19084    19006      -78     
- Misses             2749     2875     +126     

Impacted Files	Coverage Δ
python/cudf/cudf/core/udf/__init__.py	50.00% <ø> (ø)
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	84.31% <76.00%> (-12.57%)	⬇️
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 15 more

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[vuule]

Thank you!

[davidwendt]

@gpucibot merge