Bump github.com/sigstore/cosign/v2 from 2.0.2 to 2.4.0

Bumps [github.com/sigstore/cosign/v2](https://github.com/sigstore/cosign) from 2.0.2 to 2.4.0.
- [Release notes](https://github.com/sigstore/cosign/releases)
- [Changelog](https://github.com/sigstore/cosign/blob/main/CHANGELOG.md)
- [Commits](sigstore/cosign@v2.0.2...v2.4.0)

---
updated-dependencies:
- dependency-name: github.com/sigstore/cosign/v2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>