Fix ndarray conv2d groups channels #8489

Job	Run time
prepare-checks	2s
code-quality (stable)	2m 6s
documentation (stable)	4m 18s
linux-std-vulkan-tests (stable)	34m 56s
linux-std-cuda-tests (stable)	15m 4s
linux-std-wgpu-tests (stable)	20m 37s
linux-std-tests (prev)	12m 32s
linux-std-tests (stable)	34m 52s
windows-std-tests (stable)	20m 51s
linux-no-std-tests (stable)	5m 40s
linux-no-std-tests (prev)	5m 48s
	2h 36m 46s

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