Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 3.8.2 to 3.9.1.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](
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| .. | ||
| build-individual.yml | ||
| build-unified.yml | ||
| reviewdog.yml | ||
| trigger-rebuilds.yml | ||