increasing sigma #1003

Job	Run time
regression_tests	5m 39s
conda_tests (ubuntu-latest)	24m 10s
run_pytorch	4m 1s
conda_tests (macos-14)	27m 43s
run_package_tests (macos-14, 3.10)	1h 20m 29s
run_jax	2m 20s
run_package_tests (ubuntu-latest, 3.10)	1h 27m 49s
run_package_tests (macos-14, 3.13)	1h 9m 47s
run_package_tests (ubuntu-latest, 3.13)	1h 14m 43s
full_coverage	0s
	6h 16m 41s

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