Fix compile errors from device_scalar constructor signature change.

[mythrocks]

Fixes #5041.

rapidsai/rmm#2527 changes the signature of rmm::device_scalar's constructor, so as not to take r-value references.

decimal_utils.cu and charset_decode.cu were mistakenly passing r-values to rmm::device_scalar's constructor. This is a bug, because there is no guarantee that the r-value would be alive by the time its value is read and copied to device memory.

This commit changes the call sites to use l-value references.

Note that stream.sync()s aren't required here, immediately after the device_scalars are constructed. The source objects remain alive for the copy, and there are stream syncs downstream
(e.g. flag->value(stream)).

[greptile-apps]

Greptile Summary

The PR updates cuDF and RMM revisions to incorporate the revised rmm::device_scalar constructor contract, then replaces two temporary initializer arguments with function-scoped l-values.

• Initializes the charset decoding error flag from a named int32_t value.
• Initializes the decimal conversion failure-row sentinel from a named cudf::size_type value.
• Advances the cuDF submodule and corresponding RMM dependency pin.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete correctness, security, or build failure identified in the changed code.

The named scalar initializer values remain in scope until downstream synchronized reads, and the dependency and call-site updates consistently address the constructor signature change.

Important Files Changed

Filename	Overview
src/main/cpp/src/charset_decode.cu	Replaces the temporary report-flag initializer with a function-scoped l-value that remains alive through the synchronized flag read.
src/main/cpp/src/decimal_utils.cu	Replaces the temporary failure-row sentinel with a function-scoped l-value that remains alive through result retrieval.
thirdparty/cudf	Advances the cuDF submodule revision associated with the upstream RMM API change.
thirdparty/cudf-pins/versions.json	Advances the pinned RMM revision used by the native dependency build.

_{Reviews (1): Last reviewed commit: "Fix compile errors from decimal_scalar c..." | Re-trigger Greptile}

[mythrocks]

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