sigstore/cosign-installer v2.3.0

on GitHub

What's Changed

• Bump actions/checkout from 3.0.0 to 3.0.1 by @dependabot in #72
• Bump actions/checkout from 3.0.1 to 3.0.2 by @dependabot in #75
• update cosign to use 1.8.0 as default by @cpanato in #76
• changes download URL for cosign binary to github.com instead of GCS

Full Changelog: v2.2.1...v2.3.0