fix PDL type mismatch

[kevinxie4c]

Description

Fix the PDL type mismatch due to the hard-coding. The encoding of data type in PDL changed so the hardcoded DTYPE_MX_TO_PDL in MXNet v1.5 doesn't work with the latest PDL (PDL v2.082).

Checklist

Essentials

• [BUGFIX] fix PDL type mismatch

Changes

• perl-package/AI-MXNet/lib/AI/MXNet/Base.pm

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[sergeykolychev]

https://github.com/apache/mxnet/commit/58c936899a1afb0844811d3419f09b917a214e62