remove unsued import #6722

Job	Run time
telemetry-setup	5s
checks / other-checks	46s
checks / check-style	2m 12s
changed-files / Check changed files	18s
devcontainer / amd64, 12.5, conda	34m 42s
devcontainer / amd64, 12.5, pip	1h 28m 57s
wheel-build-pylibcugraph	0s
conda-cpp-build	0s
wheel-build-cugraph	0s
wheel-tests-pylibcugraph	0s
conda-cpp-tests	0s
conda-cpp-checks	0s
conda-python-build	0s
wheel-tests-cugraph	0s
docs-build	0s
conda-python-tests	0s
conda-notebook-tests	0s
pr-builder / run	1s
telemetry-summarize	17s
	2h 7m 18s

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