Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 3.9.0 to 3.9.1.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](
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| .. | ||
| build.yml | ||
| flakehub-tagged.yml | ||
| main.yml | ||
| pr.yml | ||
| tag.yml | ||
| test.yml | ||
| zizmor.yml | ||