Bump sigstore/cosign-installer from 2.0.1 to 2.1.0 (#708)

* Bump sigstore/cosign-installer from 2.0.1 to 2.1.0

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 2.0.1 to 2.1.0.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](https://github.com/sigstore/cosign-installer/compare/179e0f15e70e22ca2e7254fc12d68a9fbab35614...581838fbedd492d2350a9ecd427a95d6de1e5d01

)

---
updated-dependencies:
- dependency-name: sigstore/cosign-installer
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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* update version comment

Signed-off-by: cpanato <ctadeu@gmail.com>

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Co-authored-by: cpanato <ctadeu@gmail.com>