fix include fstream #1606

Job	Run time
checks / check-style	1m 6s
checks / other-checks	35s
changed-files / Check changed files	9s
devcontainer / amd64, 12.5, conda	9m 11s
devcontainer / amd64, 12.5, pip	9m 12s
wheel-build-cuvs / compute-matrix	7s
conda-cpp-build / compute-matrix	1s
conda-cpp-build / 11.8.0, 3.10, amd64, rockylinux8	9m 18s
conda-cpp-build / 12.5.1, 3.10, amd64, rockylinux8	6m 34s
conda-cpp-build / 11.8.0, 3.10, arm64, rockylinux8	9m 50s
conda-cpp-build / 12.5.1, 3.10, arm64, rockylinux8	5m 49s
wheel-build-cuvs / 11.8.0, 3.10, amd64, rockylinux8	7m 22s
wheel-build-cuvs / 12.5.1, 3.10, amd64, rockylinux8	7m 24s
wheel-build-cuvs / 11.8.0, 3.11, amd64, rockylinux8	7m 22s
wheel-build-cuvs / 12.5.1, 3.11, amd64, rockylinux8	7m 8s
wheel-build-cuvs / 11.8.0, 3.12, amd64, rockylinux8	7m 18s
wheel-build-cuvs / 12.5.1, 3.12, amd64, rockylinux8	7m 5s
wheel-build-cuvs / 11.8.0, 3.10, arm64, rockylinux8	7m 44s
wheel-build-cuvs / 12.5.1, 3.10, arm64, rockylinux8	7m 34s
wheel-build-cuvs / 11.8.0, 3.11, arm64, rockylinux8	7m 35s
wheel-build-cuvs / 12.5.1, 3.11, arm64, rockylinux8	7m 36s
wheel-build-cuvs / 11.8.0, 3.12, arm64, rockylinux8	7m 35s
wheel-build-cuvs / 12.5.1, 3.12, arm64, rockylinux8	7m 33s
wheel-tests-cuvs	0s
conda-cpp-checks	1s
conda-python-build	1s
rust-build	1s
conda-cpp-tests	1s
docs-build	1s
conda-python-tests	1s
pr-builder / run	1s
	2h 21m 15s

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