Update JNI to use new arena mr constructor

[rongou]

And fix a failing test.

[jlowe]

@gpucibot merge

[codecov]

Codecov Report

Merging #10027 (3b06f9f) into branch-22.02 (967a333) will decrease coverage by 0.07%.
The diff coverage is n/a.

❗ Current head 3b06f9f differs from pull request most recent head 4210c7a. Consider uploading reports for the commit 4210c7a to get more accurate results

@@               Coverage Diff                @@
##           branch-22.02   #10027      +/-   ##
================================================
- Coverage         10.49%   10.41%   -0.08%     
================================================
  Files               119      119              
  Lines             20305    20495     +190     
================================================
+ Hits               2130     2134       +4     
- Misses            18175    18361     +186     

Impacted Files	Coverage Δ
python/custreamz/custreamz/kafka.py	29.16% <0.00%> (-0.63%)	⬇️
python/dask_cudf/dask_cudf/sorting.py	92.30% <0.00%> (-0.61%)	⬇️
python/cudf/cudf/__init__.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/frame.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/index.py	0.00% <0.00%> (ø)
python/cudf/cudf/io/parquet.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/series.py	0.00% <0.00%> (ø)
python/cudf/cudf/utils/utils.py	0.00% <0.00%> (ø)
python/cudf/cudf/utils/dtypes.py	0.00% <0.00%> (ø)
python/cudf/cudf/utils/ioutils.py	0.00% <0.00%> (ø)
... and 22 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 093b0ad...4210c7a. Read the comment docs.