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

dependabot[bot] wants to merge 1 commit intopre-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