update conda environment file to include only the minimum #3216

Job	Run time
devcontainer / build (amd64, 12.0, conda)	7m 22s
devcontainer / build (amd64, 12.0, pip)	9m 19s
checks / check-style	3m 15s
checks / other-checks	50s
conda-cpp-build	0s
wheel-build-pylibcugraph	0s
conda-python-build	0s
conda-cpp-tests	0s
wheel-tests-pylibcugraph	0s
conda-python-tests	0s
conda-notebook-tests	0s
docs-build	0s
wheel-build-cugraph	0s
wheel-build-nx-cugraph	0s
wheel-tests-cugraph	0s
wheel-tests-nx-cugraph	0s
pr-builder	0s
	20m 46s

Provide feedback