chore: bump sigstore to 2.0.0 (#2081) #716

Job	Run time
tests (ubuntu-latest, unit, 3.8)	1m 13s
tests (ubuntu-latest, unit, 3.9)	1m 6s
tests (ubuntu-latest, unit, 3.10)	1m 0s
tests (ubuntu-latest, unit, 3.11)	1m 10s
tests (ubuntu-latest, integration, 3.8)	3m 57s
tests (ubuntu-latest, integration, 3.9)	2m 55s
tests (ubuntu-latest, integration, 3.10)	3m 58s
tests (ubuntu-latest, integration, 3.11)	2m 52s
tests (ubuntu-latest, tool, 3.8)	1m 0s
tests (ubuntu-latest, tool, 3.9)	1m 3s
tests (ubuntu-latest, tool, 3.10)	53s
tests (ubuntu-latest, tool, 3.11)	1m 0s
tests (windows-2022, unit, 3.8)	3m 35s
tests (windows-2022, unit, 3.9)	1m 47s
tests (windows-2022, unit, 3.10)	2m 27s
tests (windows-2022, unit, 3.11)	3m 35s
tests (windows-2022, integration, 3.8)	3m 11s
tests (windows-2022, integration, 3.9)	4m 15s
tests (windows-2022, integration, 3.10)	3m 48s
tests (windows-2022, integration, 3.11)	3m 36s
tests (windows-2022, tool, 3.8)	4m 38s
tests (windows-2022, tool, 3.9)	5m 35s
tests (windows-2022, tool, 3.10)	4m 44s
tests (windows-2022, tool, 3.11)	5m 35s
coverage	12s
	1h 9m 5s

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