Add missing namespace and include #5069

Job	Run time
checks / check-style	1m 11s
devcontainer / build (amd64, 12.5, conda)	3m 37s
checks / other-checks	35s
devcontainer / build (amd64, 12.5, pip)	3m 36s
conda-cpp-build / compute-matrix	3s
wheel-build-pylibraft / compute-matrix	2s
conda-cpp-build / 11.8.0, 3.10, amd64, ubuntu22.04	2m 2s
wheel-build-pylibraft / 11.8.0, 3.10, amd64, rockylinux8	1m 55s
conda-cpp-build / 12.5.1, 3.10, amd64, ubuntu22.04	2m 2s
wheel-build-pylibraft / 12.5.1, 3.10, amd64, rockylinux8	1m 58s
conda-cpp-build / 11.8.0, 3.10, arm64, ubuntu22.04	2m 3s
wheel-build-pylibraft / 11.8.0, 3.11, amd64, rockylinux8	1m 55s
conda-cpp-build / 12.5.1, 3.10, arm64, ubuntu22.04	2m 3s
wheel-build-pylibraft / 12.5.1, 3.11, amd64, rockylinux8	1s
wheel-build-pylibraft / 11.8.0, 3.10, arm64, rockylinux8	2m 27s
wheel-build-pylibraft / 12.5.1, 3.10, arm64, rockylinux8	2m 2s
wheel-build-pylibraft / 11.8.0, 3.11, arm64, rockylinux8	2m 1s
wheel-build-pylibraft / 12.5.1, 3.11, arm64, rockylinux8	1m 57s
conda-cpp-tests	1s
conda-python-build	1s
conda-cpp-checks	1s
docs-build	1s
conda-python-tests	1s
wheel-tests-pylibraft	1s
wheel-build-raft-dask	1s
wheel-tests-raft-dask	1s
pr-builder	1s
	31m 39s

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