Bump sigstore/gh-action-sigstore-python from 3.0.1 to 3.1.0 #6449

Job	Run time
tests (ubuntu-latest, 3.8, find_paths)	33s
tests (ubuntu-latest, 3.8, path_filtering)	31s
tests (ubuntu-latest, 3.8, data_dependency)	33s
tests (ubuntu-latest, 3.8, interface)	32s
tests (ubuntu-latest, 3.8, upgradability)	49s
tests (ubuntu-latest, 3.8, flat)	31s
tests (ubuntu-latest, 3.8, slither_config)	34s
tests (ubuntu-latest, 3.12, data_dependency)	29s
tests (ubuntu-latest, 3.12, interface)	29s
tests (ubuntu-latest, 3.8, printers)	1m 13s
tests (ubuntu-latest, 3.12, upgradability)	49s
tests (ubuntu-latest, 3.12, erc)	33s
tests (ubuntu-latest, 3.12, find_paths)	27s
tests (ubuntu-latest, 3.12, flat)	29s
tests (ubuntu-latest, 3.12, path_filtering)	27s
tests (ubuntu-latest, 3.8, erc)	33s
tests (ubuntu-latest, 3.12, printers)	1m 7s
tests (ubuntu-latest, 3.12, slither_config)	25s
	11m 4s

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