Enable warnings as errors for Python tests #1355

Job	Run time
checks / other-checks	39s
devcontainer / build (amd64, 12.2, conda)	2m 50s
devcontainer / build (amd64, 12.2, pip)	3m 6s
checks / check-style	1m 24s
conda-cpp-build / compute-matrix	2s
wheel-build / compute-matrix	2s
wheel-build / 11.8.0, 3.9, amd64, rockylinux8	2m 39s
wheel-build / 12.2.2, 3.9, amd64, rockylinux8	2m 35s
wheel-build / 11.8.0, 3.10, amd64, rockylinux8	2m 51s
wheel-build / 12.2.2, 3.10, amd64, rockylinux8	2m 51s
wheel-build / 11.8.0, 3.11, amd64, rockylinux8	2m 53s
wheel-build / 12.2.2, 3.11, amd64, rockylinux8	2m 53s
wheel-build / 11.8.0, 3.9, arm64, rockylinux8	2m 26s
wheel-build / 12.2.2, 3.9, arm64, rockylinux8	2m 28s
wheel-build / 11.8.0, 3.10, arm64, rockylinux8	2m 36s
wheel-build / 12.2.2, 3.10, arm64, rockylinux8	2m 42s
wheel-build / 11.8.0, 3.11, arm64, rockylinux8	2m 35s
wheel-build / 12.2.2, 3.11, arm64, rockylinux8	2m 39s
conda-cpp-build / 11.8.0, 3.10, amd64, ubuntu22.04	5m 36s
conda-cpp-build / 12.2.2, 3.10, amd64, ubuntu22.04	7m 17s
conda-cpp-build / 11.8.0, 3.10, arm64, ubuntu22.04	8m 0s
conda-cpp-build / 12.2.2, 3.10, arm64, ubuntu22.04	5m 1s
wheel-tests	0s
conda-cpp-tests	1s
conda-python-build	1s
conda-python-tests	1s
docs-build	1s
pr-builder	1s
	1h 6m 10s

Provide feedback