Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 3.3.0 to 3.4.0.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](
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| ISSUE_TEMPLATE | ||
| workflows | ||
| dependabot.yml | ||
| pull_request_template.md | ||