Add `cuda_spec` to `meta.yaml`'s Jinja vars #176

Job	Run time
checks / other-checks	44s
checks / check-style	1m 55s
conda-cpp-build / compute-matrix	3s
conda-cpp-build / build (11.8.0, ubuntu22.04, amd64, 3.10)	8m 40s
conda-cpp-build / build (11.8.0, ubuntu22.04, arm64, 3.10)	7m 47s
conda-cpp-build / build (12.0.1, ubuntu22.04, amd64, 3.10)	9m 46s
conda-python-build / compute-matrix	2s
conda-python-build / build (11.8.0, ubuntu22.04, amd64, 3.9)	5m 13s
conda-python-build / build (11.8.0, ubuntu22.04, arm64, 3.9)	4m 6s
conda-python-build / build (11.8.0, ubuntu22.04, amd64, 3.10)	4m 47s
conda-python-build / build (11.8.0, ubuntu22.04, arm64, 3.10)	3m 55s
conda-python-build / build (12.0.1, ubuntu22.04, amd64, 3.9)	5m 16s
conda-python-build / build (12.0.1, ubuntu22.04, amd64, 3.10)	5m 0s
conda-python-tests / compute-matrix	3s
docs-build / build	4m 18s
conda-python-tests / tests (11.2.2, centos7, amd64, 3.9, v100, earliest)	13m 11s
conda-python-tests / tests (11.4.1, ubuntu20.04, amd64, 3.9, v100, latest)	16m 10s
conda-python-tests / tests (11.8.0, ubuntu22.04, amd64, 3.10, v100, latest)	14m 10s
conda-python-tests / tests (12.0.1, ubuntu22.04, amd64, 3.10, v100, latest)	13m 57s
pr-builder	0s
	1h 59m 3s

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