Remove incorrect std::move call on return variable

[davidwendt]

Returning a unique pointer using std::move causes a compile error for gcc 9 and above.
Simple fix to remove the incorrect move semantic in segmented_sort.cu get_segment_indices.

[galipremsagar]

rerun tests

[codecov]

Codecov Report

Merging #7319 (795f51f) into branch-0.18 (8860baf) will increase coverage by 0.12%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           branch-0.18    #7319      +/-   ##
===============================================
+ Coverage        82.09%   82.21%   +0.12%     
===============================================
  Files               97      100       +3     
  Lines            16474    16955     +481     
===============================================
+ Hits             13524    13940     +416     
- Misses            2950     3015      +65     

Impacted Files	Coverage Δ
python/cudf/cudf/__init__.py	100.00% <ø> (ø)
python/cudf/cudf/_fuzz_testing/avro.py	0.00% <ø> (ø)
python/cudf/cudf/_fuzz_testing/csv.py	0.00% <ø> (ø)
python/cudf/cudf/_fuzz_testing/fuzzer.py	0.00% <ø> (ø)
python/cudf/cudf/_fuzz_testing/io.py	0.00% <ø> (ø)
python/cudf/cudf/_fuzz_testing/json.py	0.00% <ø> (ø)
python/cudf/cudf/_fuzz_testing/main.py	0.00% <ø> (ø)
python/cudf/cudf/_fuzz_testing/orc.py	0.00% <ø> (ø)
python/cudf/cudf/_fuzz_testing/parquet.py	0.00% <ø> (ø)
python/cudf/cudf/_fuzz_testing/utils.py	0.00% <ø> (ø)
... and 76 more

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[davidwendt]

@gpucibot merge