🌱 Bump sigstore/cosign-installer from 2.5.1 to 2.6.0 (#2253)

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 2.5.1 to 2.6.0.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](b3413d484c...f3c664df7a)

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

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/publishimage.yml

@@ -61,7 +61,7 @@ jobs:
             make install
             make scorecard-ko
      - name: Install Cosign
-       uses: sigstore/cosign-installer@b3413d484cc23cf8778c3d2aa361568d4eb54679
+       uses: sigstore/cosign-installer@f3c664df7af409cb4873aa5068053ba9d61a57b6
      - name: Sign image
        run: |
           cosign sign ghcr.io/${{github.repository_owner}}/scorecard/v4:${{ github.sha }}