Upgrade: Bump github.com/sigstore/sigstore from 1.8.9 to 1.9.1#307

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pre-mainintelops/genval:pre-mainfrom

dependabot/go_modules/pre-main/github.com/sigstore/sigstore-1.9.1intelops/genval:dependabot/go_modules/pre-main/github.com/sigstore/sigstore-1.9.1Copy head branch name to clipboard