LArLATOMEDecoder: Use unique_ptr instead of hand-crafted new/delete

The title says it all ...

This merge request affects 1 package:

• LArCalorimeter/LArCnv/LArByteStream

This merge request affects 1 file:

• LArCalorimeter/LArCnv/LArByteStream/src/LArLATOMEDecoder.cxx

Adding @pavol as watcher

added LAr main review-pending-level-1 labels

CI Result SUCCESS (hash f33e8c29)

	Athena
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 10057] (remote access info)

Changes look good - approving

L1 shifter

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 916c74d5