Old version in doc

[KornevNikita]

See https://docs.sigstore.dev/quickstart/quickstart-ci/#signing-files-using-your-ci-system:

The last version is 3.0.1

[woodruffw]

Hey @KornevNikita, sorry for the delayed response here. FWIW this repo doesn't track those docs; that would be sigstore/docs. I don't have the ability to migrate this issue there, so I'd suggest filing upstream there.