Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 3.8.2 to 4.0.0.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](
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| .. | ||
| codeql | ||
| ISSUE_TEMPLATE | ||
| workflows | ||
| actionlint.yaml | ||
| CODEOWNERS | ||
| dependabot.yml | ||
| label-policy.json | ||
| labeler.yml | ||
| pull_request_template.md | ||