Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 3.0.5 to 3.1.0.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](
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| .. | ||
| images.yaml | ||
| integration-tests.yaml | ||
| unit-tests.yaml | ||