Update Cosign description

[haydentherapper]

Summary

Release Note

Documentation

[github-actions]

🍹 preview on sigstore-github-sync/sigstore/github-prod

Pulumi report

Previewing update (sigstore/github-prod)

View Live: https://app.pulumi.com/sigstore/sigstore-github-sync/github-prod/previews/2c81662f-5335-4613-9c30-4963b35e7ed0

@ Previewing update.....
pulumi:pulumi:Stack: (same)
[urn=urn:pulumi:github-prod::sigstore-github-sync::pulumi:pulumi:Stack::sigstore-github-sync-github-prod]
~ github:index/repository:Repository: (update) 🔒
    [id=cosign]
    [urn=urn:pulumi:github-prod::sigstore-github-sync::github:index/repository:Repository::cosign]
  ~ description: "Container Signing" => "Code signing and transparency for containers and binaries"
@ Previewing update....
Resources:
~ 1 to update
573 unchanged