Bump sigstore/cosign-installer from 2.6.0 to 2.7.0 (#476)

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 2.6.0 to 2.7.0.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@f3c664d...ced07f2)

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

Signed-off-by: dependabot[bot] <support@github.com>

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

.github/workflows/ci.yaml

@@ -35,7 +35,7 @@ jobs:
           install-only: true
 
       - name: Install cosign
-        uses: sigstore/cosign-installer@f3c664df7af409cb4873aa5068053ba9d61a57b6 # v2.6.0
+        uses: sigstore/cosign-installer@ced07f21fb1da67979f539bbc6304c16c0677e76 # v2.6.0
 
       - name: Install syft
         uses: anchore/sbom-action/download-syft@b5042e9d19d8b32849779bfe17673ff84aec702d # v0.12.0

.github/workflows/release.yaml

@@ -36,7 +36,7 @@ jobs:
           install-only: true
 
       - name: Install cosign
-        uses: sigstore/cosign-installer@f3c664df7af409cb4873aa5068053ba9d61a57b6 # v2.6.0
+        uses: sigstore/cosign-installer@ced07f21fb1da67979f539bbc6304c16c0677e76 # v2.6.0
 
       - name: Install syft
         uses: anchore/sbom-action/download-syft@b5042e9d19d8b32849779bfe17673ff84aec702d # v0.12.0